What case you have determines how many fans will fit. Get fans with built in RGB and not those with an extra RGB plug ie.2 wires from the fan as then you could be very limited. Corsair do good RGB fans that are effective and quiet in my experience, I have 7 red ones in my case 🆒
Also remember you PSU has to power them make sure you have enough juice, you can easily run 3-5 fans off 1 MoBo fan header using a splitter cable.
The case you have will take 1 front, 1 behind and 2 x120mm on top for sure.
Front: 120/140 mm fan mount x 2
Top: 120 mm fan mount x 2
Rear: 120 mm fan mount x 1
You're going to need a fan hub if you want to RGB all those fans...
A problem regarding the RGB fans that are powered through a single connector is that their performance is poor; sacrificing performance for aesthetics.