You could wall mount the M22s as another option? There are wall anchors for brick and cement.

As for the M60s, I have mine a few inches away rom the wall and they sound fine. I have moved them out as well and there is only a slight difference in the bass.


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