Sanus WSWM22 (Black) Pair of adjustable wall-mount brackets for Sonos One, Play:1, and Play:3 speakers at Crutchfield
SANUS WSWM21WSWM22 Installation Video - YouTube
Amazon.com: SANUS Adjustable Height Wireless Speaker Stands Designed for Sonos One, One SL, and Play:1 - Tool-Free Adjustment up to 16" and Built-in Cable Management - Black / Pair : Electronics