Dipole Speakers In Wall or On Wall? Thoughts??

As a casual observer to this site (daily) I know just enough to be dangerous....:-)

I would assume that ANY in-wall speaker would have to be direct radiating. No dipole. No bipole. To me, that is the only logical answer.

The chances that I'm wrong are large, however.

Slightly off the wall, about 25%to 30% of speakers depth and 20%down from the ceiling heighth.(ASC website as a reference to this information.)

A customer of mine stuck a pair of Magnepan 20.1 into a wall with huge foamed coves behind them. They sound decent but the recessed install robbed them of the Maggie magic. When dipoles can't radiate the out of phase waves into the listening space, it changes their sonic signature.

Thanks for the response guys. I was thinking of either Paradigm ADP on wall or B&W in walls. Seems that the on wall type might be best. Any recommendations on speakers. I'm listening. Thanks Again for your help Gang!!!