Use this adapter to mount a Ring Pro video door bell to your siding. This is designed with a 15 degree angle so if you mount it to the side of your door it will point more toward the center of your door. (You can probably mirror it along the axis to make the angle point the camera to the opposite direction)

The recessed mounting holes on the front are designed for standard exterior screws. Alternatively, you can use the mounting tabs with smaller screws.