So I have often read that the falling smoke detectors after a few days back down.
That's why I hang my time with the left.
have only the magnetic fixing glued to the ceiling with a drop of superglue gel (rough plaster ceiling -> why the additional adhesive) and then allowed times a day without the smoke detector on the ceiling so that no weight immediately hangs and then after one day because smoke detector off ,
nor are they all on the ceiling
Conclusion: ++ no Boren
+ Assembled quickly
- Superglue GEL bought separately to make sure that they stay up ;-)