Mine is sitting on two concrete pavers about 2" thick, on the floor beneath the equipment rack. Got the pavers at Home Depot.
P300 Users: where do you place the unit?
Considering the size and the heat, where do you place the unit? Do you have a shelf just for it? Is it on top? Do you have anything next to it? I am thinking of getting one of these, but after finding out about the heat and size, I was wondering about where I could possibly place the unit.