Well I keep it on wooden tile flooring next to my TV in the living room I don't place it on any stands like the majority of the people do, but I keep it standing up since it seems to gather more air that way in my house.
My house has no door access accept to bedrooms, bathrooms, and the outside. So the environment is nice and cool for the system.
It's really where your going to place it that'll matter too, my other recommendation is to keep it away from other electronics it really helps out.