I have the screwed inserts deliberately chosen because I've seen it the advantage that they do not fall off, for example by heat / dry heated air. When screwing in brand outlets, I noticed that the screws were too short. So get searched in 3 DIY and longer screws. They're not getting. During the research on the internet I found out that the VDE and thus the manufacturers do not register the outlets for such protection, because the contact surface of the plug shortened and thus may increase the risk of fire. Whether it comes to that, of course, theoretically, but it is questionable why one can sell anything if the use by manufacturers and VDE is not allowed and you get it only because the screws are too short.
