How do you fit an Aldi simply bathroom hairdryer holder to the wall with the suction cups - the screw will not tighten?

had the same problem with a suction cup shower corner tray. if you push the suction cup firmly to the tiles it doesn't leave enough plastic thread protruding to screw retaining nut onto. Pushing the suction cup on lightly will leave enough thread but tray will probably then fall off the wall. Poorly designed product.