Front height or surround: Polk OWM3 vs Monitor M3 Series 2

Looking to install front height OR surround speakers: which one would sound best: the OWM3 or the M3 Series 2?
Or could 1 pair be used for the front heights and the other pair for the surronds?
I'm asking because I found a cheap used pair of M3 for $40, in great shape....
RTiA5 + CSiA4 + Jamo SW410E
Yamaha TSR-700 (equivalent to RX V6A)
No surround...yet