You have not told us how many case ventilation fans you intend, and in which locations.
You also have not mentioned the concept of balance between intake and exhaust air flow capacity, so I'll deal with that first. To start with, what goes in MUST come out, so no matter what you do some air will flow through. Any imbalance between intake and exhaust will result in a small air pressure difference between the exterior (your room) and the interior of your case. This means that, at every small crack or hole, air will leak from the higher-pressure zone to lower. I prefer to have a small positive pressure INside the case so that air leakage flow outwards. Why? That prevents entry of room air containing dust. BUT that also means you MUST place dust filters at every fan intake point to prevent dust coming in there. Most cases come with some type of dust filter system (even if just a small screen mesh) at the common intake areas (e.g., case front) that you just need to clean from time to time. To accomplish a near-balance of intake and exhaust air flow capacity with a small bias towards more intake capacity, you can START with the number of case fans and their total max air flow ratings, but this is NOT a complete picture. IF you are using a liquid-cooled CPU cooler and rad they become part of this, but YOU are not doing that, OP. However, the dust filters on the intake fans do reduce their real air flow impact to less than their max rating, so exactly matching numbers of intake and exhaust fans does NOT get you the right balance. In my view, the ideal would be slightly less exhaust capacity rating to offset the small reduction of intake from the dust filters. For your specific case, my "ideal" might be three 140 mm front intakes, two 140 mm top exhausts, and one 120 mm rear exhaust. Intake fans' total max air flow exceeds exhaust fans' total max by ratings, so we expect that the small impact of the front fans' dust filters will still leave a slight positive pressure inside your case. For the two TOP exhaust fans, mount them to the REAR of the case as much as your case allows (you may not have any choice there) to avoid having an air flow "short circuit" inside the top front corner of your case.
Now, that's a lot of case fans - six in total. How would you connect them to your headers? We'll look at those case fans only for now, and you really have two headers for them: SYS_FAN1 and 2A. The 2B one should not be used for PWM fans unless you need to, and you do not need to. The PUMP fan header MAY be used for fans - depends on whether your mobo allows a setting for this, and we can't see that detail. The critical item here is the max CURRENT capacity of each header. Most are 1.0 A, but you say yours are rated for 2.0 A max each. Check that to be sure. Assuming you are correct, you can use simple Splitters like this
https://www.amazon.com/Cable-Matters-2-Pack-Way-Splitter/dp/B07PXLHNZ6/ref=sr_1_4?crid=2ZOG5ZKQ1JLXF&keywords=fan+splitter&qid=1644956401&sprefix=fan+splitter,aps,98&sr=8-4
That is a 2-pack of 4-pin Splitters with 3 output arms each. NOTE that a Splitter has one imput that plugs into your mobo SYS_FAN header, and two (three in this case) arms for plugging in fans, but NO other arm types. A HUB is a different device that also has a third type of "arm" that must plug into a SATA power output from the PSU for extra power. You do not need that here as long as your headers can deliver up to 2 A per header. The fans you are considering say (in their spec sheets) their max current draw for their MOTORS is 0.38 A per 140 mm fan, or 0.45 A for the 120 mm unit. So three fans together can draw at max 1.21 A, more than a typical header can do but well within the specs for your mobo headers. So, you can group three front intake fans together on one header, and the three exhaust fans on the other. Configure both headers exactly the same so they all do the same thing. (Current draw by the LIGHTS in each fan is not part of this because lights are powered and controlled separately from motors.)
If you think that six fans total is overkill, I suggest you just cut back to two on the front (bottom and centre) and one on the top rear, and still the one 120mm at rear - total 4 fans - and still use two Splitters on the two headers.
A couple points of interest FYI regarding Splitters etc. Each fan generates a speed signal consisting of a train of pulses sent back to its mobo header on Pin #3. The header counts these pulses, but it cannot handle more than one fan's pulse stream. So any Spltter will send back to its host header the speed signal from only ONE of its fans and ignore the rest. The easiest way to do that is NOT to include Pin #3 on most of the output arms. When using s Splitter, make sure one of your fans IS plugged into the only output with ALL FOUR of its pins, so that that fans's speed can be returned to the host header. Now, a secondary function of a header is to monitor the speed signal for fan FAILURE and warn you of that if it happens. It can not do that for the "extra" fans on a Splitter whose signals are not reported. So from time to time YOU should check that all your fans are working.
Regarding your CPU cooler system with two fans, I recommend you connect them both to the CPU_FAN header. The kit includes one 2-output Splitter for this purpose.