Samsung SmartThings Multipurpose Sensor spacer

I've been frustrated several times mounting a Samsung SmartThings Multipurpose Sensor as a door open/close indicator because some doors have a large offset between the door and the door frame.

You can mount your Multipurpose Sensor directly to this thing, which provides an 8mm positive offset. This is useful, for example, on sliding doors. The stock mount provides only a 2mm positive offset.

The stock mount is also hollow on the back, which makes it hard to mount with anything besides