Beautiful but problematic mounting

The thing is sold without wall mounting plate, but the thing was supposed to be standard. Visits to DIY stores in the area (Bricomarché, Leroy Merlin), no mounting plates that can be found there is no evidence to insert this outlet, because terminals that protrude from the back of the socket and are separated by about 50 mm (overall). So direct wall mounting: do not miss in the alignment of the holes, it is not entitled to a second attempt ...

Apart from that, it is pretty :).