Hello all, thanks for all the advice...
While a single M2 would look a bit funny on top of the TV, it would probably look okay if it was on a stand below a screen. (Sorry, just trying to justify changing to a front projection :-) ).
I am putting M2s in the rear surround precisely because it will call attention to itself to pinpoint the sound source, though I will have to try it out as a center to hear how it sounds with my M22s.