I have not heard the Rotel yet personally but I have only heard good things about their digital amps and they would be excellent HT amps. In general Class D, or other digital topology, run very cool and are usually smaller, so placement is not a problem.

Although, my amp is "class V" it is still a digital amp. It is rated at 125x5 and weighs a whopping 11 lbs. It has "auto on" which it does by sensing the input signal and turning itself on. I have it tucked away in the bottom of my cabinet and after hook up haven't had to see it since.