It attaches to TV mounts with 20 x 20 to 80 x 80 cm VESA patterns, allowing you to move the soundbar around in sync with your TV. It positions the Arc 1.2″ in front of your TV, so your TV won’t block the soundbar’s Atmos speakers. Vertical and horizontal adjustments help you position your soundbar where you want it.
- For Use with the Sonos Arc
- Attaches to Your TV Mount
- For 20 x 20 to 80 x 80 cm VESA Mounts
- Vertical and Horizontal Adjustments
- Suitable for 40 to 80″ TVs
More information found here – Flexson