Hi Mike,
Indeed, the SANUS soundbar mount designed for the Sonos Arc Soundbar is compatible with all SANUS TV mounts. The soundbar mount directly attaches to the back of the TV via the mount bracket on the soundbar mount. Securement screws are used to affix both the TV mount brackets and the soundbar mount, ensuring a secure attachment to the TV. Please note that the soundbar mount specifies a minimum and maximum VESA pattern for compatibility. For any further inquiries regarding compatibility, please don't hesitate to contact us at info@sanus.com or call 1-800-359-5520.
Thank you,
SANUS Support