Bests & Worsts Reviews from Amazon

I have a fiberglass shower. I made 10+ attempts to install this and it would fall off within 3 or fewer minutes even after being properly installed with the green lights indicating so. I called a friend who is a contractor and he read the instruction and attempted installation and the same thing happened again and again. We tried several different areas of the tub, it did not matter where it was placed. Fully smooth surface, cleaned, dried. Failed and not trustworthy even if it did hold at this point given I have seen how it can be indicating safe the moment to later fall off. Not recommended!