Mount-It Black Swivel Wall Mount for Screens Holds up to 17.8 Lb.

Mounted the arms easily between the TV and another brand wall bracket. All were compatible with many mounting holes. The Sonos Arc has two built in threaded screw holes and Mount It provided screws with a giant scratch free head to slip into their bracket. Their bracket also had bottom support. Fit like a glove. Very secure. The photos show the sound bar some distance from the TV. Too much in my opinion and arms visible but given all the mounting holes I was able to revise my install prior to putting it all back on the wall with the sound bar much closer to TV. Look professional and decorator/wife approved. Lots of extra screws and parts to find the correct girth and depth.

I used this in conjunction with another brand of TV mount which lowers/raises the TV below/above my mantel. I used my own 1/4 inch bolts, washers and nylon-insert lock nuts (2x per side, using highest and lowest overlapping holes) to bolt it to the other kit. Had to go this route as my LG OLED VESA mounting holes are very low on the back of the TV the soundbar is above the TV. It's solid and looks great.