Question Should i install this extra fan even though it wouldn't be visible? [see picture for reference]

[bentenx]

Hey guys, i'm upgrading my prebuilt pc and i already bought 4 fans, but i'm not sure if should install the last one since it won't be visible (ml 120 pro rgb)
Picture of my case:

https://imgur.com/a/5ud2Vdo

View: https://imgur.com/a/5ud2Vdo
Red is where i have my fans installed already, green is the spot that i'm talking about

only 3 fans would be visible, but if i wanted to install the last one i would need to buy a fan splitter or a fan hub and i'm not sure if it's worth it.
I was thinking of maybe keeping it as a spare in case one breaks.

What do you guys think?

Specs: EVGA GeForce RTX 2060 XC Ultra Gaming KO Ultra
mobo: asrock b450m steel legend
cpu: ryzen 7 3700x
ram: Crucial Ballistix 16gb 3200 mhz
ssd: western digital sn750 nvme 500gb

 

[Karadjgne]

How's the temps? Could it be mounted on top/rear as an exhaust?

 

[bentenx]

How's the temps? Could it be mounted on top/rear as an exhaust?

Those are the only 4 spots for fans that I marked, also I’m not sure. I’m still in the process of building the system, I only need to connect my gpu and some fans and some cable management, should be done in a couple of days since I don’t have the time right now