Even on slightly uneven surface in my utility room. Only issue was that they gave me two different colors (two white, two black). Wish they were all the same. Excellent grip, easy to install, easy to use.
Adhesion is good..No doubt. But plastic parts of this thing has already broken (that's within a month)...and the sticker on the wall now won't come of with out damaging the wall....so what good is the adhesion.