A:AnswerThe side and rear speakers have a standard 1/4-20 threaded bushing recessed into the bottoms. The center speaker has no provision for mounting.
A:AnswerI got a set from Crutchfield (Pinpoint AM 24) http://www.crutchfield.com/p_121AM24W/Pinpoint-AM24-White.html?tp=586
The trick is finding ones that can mount speakers with the threaded fitting on the bottom - which is what these have. I wall mounted them because that's where the wires already exited the wall... the bottom mount forces a downward tilt, but that works for my room.
A:AnswerThe speakers are all 6 ohm but you should be OK as long as you keep volume to reasonable levels. Overheating the output transistors is the major risk at very high volumes.