Using the adhesive method, the hooks can be installed on porcelain tiles, marble tiles, metal surfaces, glass*, acrylic, solid wood, and fiberglass/plastic composite bathtub walls. They cannot be installed on wallpaper, slate, brick, or on painted, gypsum/drywall, or concrete walls. *Although the hooks attach well to glass, removal of the hooks can cause damage to the glass if not done correctly and if the glass breaks, it can be a safety issue.
Using the screw method, the hooks can be installed on most surfaces using the appropriate drill bits. However, they cannot be installed on glass, acrylic, or metal surfaces. Find out more here.