These are 45 and 60 degree wedge shaped mounting brackets for the Eufy Security Doorbell. The lower mounting hole has been replaced with a groove, making it ideal for replacing smaller existing doorbells whose screws are closer together than on the Eufy doorbell. This groove can accommodate existing holes that are 60-80mm apart.
The plate against the wall is extended to extend behind the doorbell to give it more strength in case someone pushes hard against it. Use a washer with the screw for the lower slot hole to prevent the screw head from going through. Use 100% silicone caulk between your wall and the wedge bracket to help weatherproof the assembly.
If you need it angled in the other direction, most slicers have a mirror function that lets you flip the model on an axis.
The product was designed by
kendel3d