Here is a minimalist wall mount for your Sonos One/One SL v1 speaker.
A speaker bracket that is easy to mount as it uses the keyhole pattern under the Sonos. The ring at the top of the Sonos gives the wall bracket good stability.
It is a fixed wall bracket, and the speaker can therefore not be rotated/adjusted once it is on the bracket.
Does not include mounting accessories (2 screws are required for mounting)