Adjustable Speaker Wall Mount designed for the Sonos Era 300™ (Pair)

Amazon

Designed to seamlessly blend behind Sonos Era 300 speakers Easy 15-minute installation Tool-free tilt and swivel adjustment ensure the optimal listening angle Speaker tilts 32° left and right and 4° up and 32° down Ability to mount speaker upright or inverted for desired listening experience

Hughes

WSWME32 Speaker Mount for Sonos Era 300 - White