I had my center channel above my TV right near the ceiling on a shelf about ~7'6" off the ground with the M80s on the floor and it sounded good to me and anyone auditioning never said otherwise. I now have the VP150 under my TV in the new house and it still sounds very good, not really any difference as far as I can remember.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70