The OmniMount 20.0 ceiling mounts can be quite troublesome when hanging the 532LR speakers.  The bolt used for tightening the clamp assembly must be tightened to very high degree.  This was recommended by Ben Fowler, Aperion's home theater guru.  Ben recommended using a pair of pliers on the supplied Allen wrench to torque the bolt.  I only used the supplied Allen wrench and was able to snap the stainless steel bolt in two!  It seems like OmniMount should either rethink their design or another manufacturer should be used.  (I am debating on whether or not I should return all of the OmniMount 20.0 mounts for a refund).