We just removed the yellow sticker from the clear plastic liner that covered the suction liner.
Only 1 of them was actually exposed entirely in the videos.
The grip will get stronger over time both on the suction liners and the magnets. It's not a good idea to leave it aggached for long periods of time. A few days is ok, but I wouldn't do it for weeks.
Send me an email at firstname.lastname@example.org and we'll get you sorted out.