One of the forum members (MarkSJohnson, I think) made up some nice decorative plaques which were wide enough to reach the studs, then mounted his QS8s (I think) to the plaques.

You will see threads talking about mounting QS8s without studs, and that *can* be done if you are careful, but I wouldn't try mounting FMBs that way. QS8s pull straight down, while FMBs pull "out" and will fall off the wall if you don't go into something solid.

If you have wood available at the top of the wall, and if you are mounting the M3s up high, one option might be to run a thin vertical piece of wood (maybe a 1x4) vertically, mounted to the cross member at the top and supporting the FMB at the bottom. You would probably want to bolt the FMB to the 1x4 instead of using wood screws.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8