Fits perfectly when printed on my printer, you might need to adjust it slightly bigger or smaller. I will be installing these with outdoor 3M Command Strips so I didn't need holes but adding them in the slicer is pretty easy. I've included the 3MF file so you can see the changes if you're interested.
The pictures are Overture Matte PLA but whatever material you want should work fine. If you live in a very hot environment you might want to use PETG.
Edit 2023-11-28: I added a version that allows for easily using small 3M Outdoor Command Strips. This is what I have mounted on my house today.
The author remixed this model.
I resized the original no-holes variant of the Govee light bracket to make it fit the Eufy lights.