New sales and replacements of type T12 (non-recessed) sockets have been banned since 2017, so there are no longer any plugs to go with them.
https://sinfla.ch/2018...
My recessed socket is 16mm deep. When I insert the plug there, it still protrudes 16mm above the wall. If the socket were even deeper, it could probably be inserted so far that it would only protrude 12 mm from the wall.
No, I don't think so. The plug is wider than normal because of the rotation. Unfortunately, I have mine behind a piece of furniture that is difficult to access, otherwise I would have a look.
But since the plug comes unassembled, you can connect whatever you want. I have a Steffen (master-slave) distribution strip on it. So I don't need to plug several into one socket.