Wallmount for 230V car charging cable

For my new hybrid car from mercedes I wanted to have a wall mount for the small "Wall Box" that is needed to charge the car at home with 230V.
There is nothing like this on the market so I created a wall mount in Onshape.
There are two parts, one big part for the wall-box that is integrated in the charging cable and one for the connector plug if you not charge your car.
The two parts can be connected by two M4x20mm screws (see picture).
There are holes (bores) on both sides of the big part, so that you can attache the small part also on the right side if you want.