I had a new Smoke Alarm and Sensor to hang. I am a lady of an indeterminate age and putting this alarm on the ceiling is not something that is convenient for me. I read all of the reviews and discovered a hint from a firefighter who knows his business. Gorilla Glue, yes, indeed. I used Gorilla glue to stick the backplate on the wall, pressed and held with firm pressure for 30 seconds or so. I let it dry overnight, then placed the actual smoke detector into the backplate. I placed the backplate high on my wall, not the ceiling. Worked beautifully.