You can use a 120 or 240 AIO, no problem. But if you want to use a 360, you will only be able to place it on the top. There isn't enough space on the side.

Also realize that the 4 argb fans that are provided use a proprietary connector to connect to an argb controller (the controller uses a standard 3 pins connector for argb and sata power connector for power).

Yes size 120, 240, 280, 360 mm

but only a 2 max 34 cm long

Yes, you can.