TCM, welcome. If your "viewing zone" comment indicates that you'll be sitting about 12' away, I'd give a higher recommendation to the M22s, although the M2s should provide a reasonable sound level. I'd suggest using a vertical M22(or M2)for the center speaker, to get a wider and smoother horizontal dispersion.
The QSs in a 5.1 setup should be placed a little (maybe 2-3')farther back than directly to the side so that a little bit of "phantom" back effect is added, in the absence of actual back speakers in a 7.1 setup. If this means mounting them on the back wall, they should be spread as widely as possible, almost to the side walls, since they're still side surrounds.
