The MK Grid Plus range is a modular system with items available in a range of finishes. The items are easy to fit as they simply clip in to place from the front of the mounting frame. 
The MK K3494ALM is a surface mounted, Aluminium, 2 Gang, 4 Module Grid Plate.
Requires the following
1 x K3704ZIC 4 Gang Grid
1 x 892ALM Flush Box
1 x K8892ALM Surface Box
And Grid Plus switch or product to your requirements