Review on Mounting Dream Soundbar Mount Bracket, Sound Bar TV Holder for Soundbar with/without Holes, Non-Slip Base Extends 3.4" to 6.1", Easy and Secure Installation MD5425 by Derek Kraft

Very disappointed. Please, please don't try this with your Sonos Beam. First, it's too wide. The horizontal bracket protrudes from the joist about a foot on each side. It's too wide for the joist and you'll see ugly bare metal sticking out a foot from each side of the joist. Second, this device must be integrated into existing TV wall mounts. I have one from Costco and it should be in the mounting brackets that attach to the TV. But again, it's too big, so you'll have to resort to a stack of shims to make it work. Terrible terrible product and totally false advertising.