Hi Nick,
Thanks for sharing your thoughts! To be clear though, I am aiming for big, nearly full range surrounds to match my front speakers. Axiom and many other companies sell in ceiling speakers but they in no way come close to an LFR or M speaker in terms of range or power handling. Axiom does not offer an in wall version of an M80 or M100s as far as I know, and mounting an M100 on the wall seems infeasible. The corner mount that I'm suggesting is the only way I can think of to mount such a big heavy speaker as a surround (after all everyone has both a ceiling and a couple of walls in their HT room) and as you pointed out it probably would stick out less up there!
