I have a white set in the shower to hold my iPad mini to stream TV (news) in the shower. I separately purchased 3M special easy-to-remove strips designed for high humidity areas. Although the iPad Mini is very light, I didn't want it to fall about 5 feet onto the shower floor. They've been holding it for almost a year now with no problems. I liked them so much that I bought a second set in black for a different iPad mounting situation. I recommend first sticking a line of tape on the wall (across the wall in the mounting area) and using a spirit level to make sure the line of tape is level at the top, then you can use the line of tape as a top (or bottom) guide whether you want to glue them. I also used a spirit level to make sure the "brackets" were pointing straight up against the wall as well. I think you could use light pencil marks on the painted wall, but I didn't want lines left on the shower wall after pasting, so I used masks and tape to create vertical and horizontal assembly lines.
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