This is a wireless Eufy 25º mount designed to combine with the existing 15º mounting bracket from Eufy doorbell. It provides a total angle of 40º, which is perfect for adjusting to the required field of view of your doorbell.
Installation is simple and it comes with recesses for nuts on the back for easy attachment. You can therefore easily connect your Eufy doorbell to existing wires and screw holes from the old doorbell. After attaching the 3D printed part to the existing holes, simply proceed with Eufy doorbell installation as normal.