Important mounting note: For best sound quality, mount the Sonos wall mount Arc four inches from the bottom of the TV. Unlike other compatible Sonos Arc TV mount brackets, the installation does not require you to attach or hang anything from your TV.
For a secure mounting option, make sure to tighten the screws until the entire thread portion is in the hole, which means they can't be tightened anymore. The anti-vibration locker patch on the screw threads causes them to have a little more resistance when tightening.