I just received my Yamaha RX-V483BL receiver as a replacement for my Bose unit as part of a home theater system. It's a lot "thicker" than the Bose unit, and it will not fit in the bottom of my cabinet sitting flat. I do have a side compartment that has enough room for it to sit up on its end. The receiver does not have DVD--just a receiver. Is it okay to install it up on its end? The user's manual only mentions not to use it upside down, as that would block all the cooling vents on top and cause it to overheat.