Hi dantey,
Before we introduced the bolt and the Full Metal Bracket (FMB), we advised customers to use wood screws (3/4-inch or less) into the rear baffle. They self-seal, so it doesn't affect performance. Keep a couple inches away from the inset that contains the speaker binding posts because the crossover is on the back behind the inset.
There are some brackets around that clamp the base of the speaker so you don't have to mar the finish. They are sort of clumsy but they work. Check out racksandstands.com. Big choice there.
Regards,
