Hal Kelton of DOORDATA Solutions sent me the photos below, and I would love to know your thoughts on this application. This device is attached to the door with double-sided tape, and the other part is magnetic. These are fire doors (yes, the wreath is a problem) in an assisted living facility, in an area for memory-care patients. The staff flips the device open when the resident is out of their room, and the magnet attaches it to the frame. If the resident comes back to their room, the device closes, indicating that the room is occupied.