I had the problem that my old doorbell switch was in a 60/68mm flush mounted box, and the Unifi Protect Doorbell G4 pro is a bit smaller so that not the full hole of the flush mounted box would be covered.
So, thats why we have 3D Printers, right?
A face plate for the Doorbell was designed and is now covering the flush mounted box.
2 holes needs to be drilled above and below the box, with M3 Heat Inserts and M3 screws the metal frame of the Doorbell will be mounted to the plate.
If you want to get the file with your name or number ect. as shown in the pictures, please reach out!

Happy printing!