Sanus WSSBM1-B2 Sound Bar Mount for Sonos Beam
Crutchfield Customer Review (What's this?)
Its great. Installing it can be a bit of a pain. You have to take off your current mount, put this one on and then put the other mount over it. Also, it comes with a ton of screws, but unfortunately they were either too short or too long with my set up, so I had to go buy a medium sized screw length. So other than that, its great.