I wanted to avoid that I have to drill a hole in the parquet floor to secure a doorstop.
The stoppers are 2 adhesive films. So you have 2 attempts.
I have kept the instructions and cleaned the place on the floor and free of grease to stop for 24 hours not claimed (at the second attempt even for 4 days).
Once you but only a little more firmly the door presses against the stopper. He slips away easily. And that's the idea past ...