Just a little FYI.
I just recently received a pair of M 3 bookshelfs. I'm using the FMB to wall mount them as rear surrounds. I found it odd that with the FMBs I can no longer use banana plugs, not sufficient clearance, so for the time being will use bare wire. If I decide to keep them (swapping out QS8s for a comparison) I might try wire spades. That would be a secure enough connection.
/Jeff