Use a plug socket to make a shelf.

Two shelf versions, one is big enough to lay your phone flat, the other is narrower.

Three versions of plug adapter, one slips between your charger and the socket.  The other two are plugs that fit UK sockets for making a shelf without a charger.  Both shelves fit all plugs.

The tolerances are tight so the shelves won't fall out.  Check your layer heights!