Hi,
I don't think, that having fans on both sides of the evo would be a great idea. Whem there are fans on each side, the air wouldn't be faster. Instead the two fans would make more noise then one fan alone.
cu
Michael
PS: You can put fans under the Evo by using the module, that combines tho evos, the so-called "Docking-Modul".
PS2: Welcome in our forum.