Mount-It!Adjustable Speaker Wall Mount for SONOS One, One SL and Play:1 - Black

Q: Mounting bracket came attached. How do you remove it?

I am trying to explain here. There is a bridge/hinge in center which holds connects wall mount to speaker holder. If you see from bottom, you can small plastic piece which has stripes locks mount and speaker. Press that piece and push speaker attachment (front part) and it will unlock the speaker attachment from wall mount. I hope this helps.

Q: Are tbe mounts sold in pairs?

I just bought one. I didn’t have the option to buy by the pair which was fine for me since I only have one outside speaker for my 8c25’ second level deck