If for any reason you think a 9" x 6" vent cover would look better than a double socket and its associated plugs and wires, this could be just what you want.
It utilises a standard vent cover, which I had available, so I didn't try to print that part. This is just the piece which provides clearance over the socket, plugs and wires.
A couple of screw holes are provided to fasten it to the wall and there are four holes to accept self tapping screws to fasten the vent (243mm x 149mm spacing).
There is a hole for wires to pass through.

Qidi X-Plus

No

No

0.2

10%