Downsized so only one double garage here. Actually I measured wrong originally for this beam sensor, so I have ordered a longer one, but not received it yet. When I get it I'm tempted to crack it open and "fix" that constantly clicking relay problem. I've fixed it electronically with the ELK timer, but if the beam stays blocked, the constantly clicking relay is quite annoying. I'm sure it serves some purpose, but not mine.
As for using as a safety for the garage door, I haven't connected it to the garage doors beam sensor. Rather since I have open, close and beam sensors connected to the Omni, and the Omni can control the opener as well, its easy to stop the door if the beam is broken but only while closing. It works well.