I bought the product at the hardware store, the video was promising. At home, I cleaned the tiles thoroughly with 96% alcohol. After attaching the thing crashed down after a few minutes. I once read through the assembly instructions. Actually, everything is done correctly. Then I have the tiles again so thoroughly it cleaned with scouring milk, water and alcohol and then mounted. Not 5 minutes later it was back on the ground. Either I'm too stupid or the product is not as great as advertised here.
