Purchased specifically to mount a sonos beam bellow my tv and it fit perfectly. The quality of this mount was better then the one holding up my 75" tv! It was easy to assemble and install. Two tips: for anyone mounting below the tv, Choose mounting holes that leave an inch of space between the top of the sonos and the bottom of the tv so you don't block the ir sensor for the remote. I made this mistake the first time and had to redo everything, but it was still easy. The other tip is if the horizontal bar is wider then the distance of your mounting screws you don'e need the two extension pieces provided.