2 M2's from all reports works extremely well for those that have run this above and below configuration. 2 VP series speakers above and below works very well too, which I have tried with my VP100 and VP150.

Mounting M22s close to a wall actually helps re-enforce the lower frequencies but I would try to keep the box as open as possible to allow the rear port to do its job.


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