When you say "they don't appear to be suited for ceiling mounting," are you speaking of the FMBs, or the M2s? If you'll check the photos at the bottom of of Page 1 in this thread, you'll see that Daphoid had no problem ceiling mounting his QS8s with the FMBs. He has them attached to a joist just above the drop ceiling. What specific problem are you having when trying to ceiling mount the M2s with the FMB?

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton