ARLO WIRELESS DOORBELL (does not fit wired only mount or 2k Version only fits older style with round button.)
Fits this doorbell linked on Amazon:
90 degree swivel mount.
Rotate, Swivel, and adjust the doorbell up to 90 degrees in any direction. Screws are included to mount the doorbell to the bracket. Use your own screws for your wall installation. A center hole is included in the mount to route the wires.
This mount is mainly used for perpendicular installation where the doorbell is on a side wall next to the door.
Doorbell not included
The swiveling mount can rotate in just about any direction from 15 to 90 degrees. Really it can rotate 15-90 then 105 to 180. It can look left or right, tilt up and down.