Here is a minimalist wall mount for your Sonos One/One SL v1 speaker.
A speaker bracket that is easy to install 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 locking wall bracket, and the speaker cannot therefore be rotated/adjusted once it is on the bracket.
Does not include mounting accessories (you need 2 screws for mounting)