My coworker is willing to weld me up a 2 amp rack. I just swapped out my little 4 channel (taramps ts400x4) with a rf power 400x4 and everything fits just a bit closer than I'd like. My question is how much space should I leave between amps (one will be directly above the other)? I'm figuring I'll need to mount a pair of fans as well to keep the temp during the summer here especially on the ab class rf