Effectively fix this using the suction cups is pure DIY sanding the plastic screw, "préventousage" (the screw can not be fixed without significantly depressing the suction cup before placing it on the wall), and very violent support .
These mounts are designed for other products in the range and in these cases work well and easily, but for this mirror is not suitable. The screws should be longer. Missing 5 mm.
But after much effort, it is fixed. Dour Pouvou qué it!