Unfortunately, there is no 'off the shelf' box available for the purpose of wall mounting.

The PL-10 and the PL-6 share the same box, (PL-10 has rotary faders / PL-6 linear)

Unfortunately, when fixing in plasterboard, the two 4mm diameter holes at the top and bottom of the faceplate (92mm apart) are too close to the edges, meaning that the plasterboard will crack. Batons of wood can be used to mount the faceplate on, but an easier alternative is to remove the 'fast feet' on the base of the unit and use these holes to secure the unit to the wall.

The unit will need to be taken apart to do this, but it is a straightforward procedure.