Remove the NTE5C and drill straight through the backing box into the cupboard, etc. Relocate the NTE5C and the Mk 4 SSFP. Fit a blanking plate where the NTE5C is currently situated.
Have three double-gang mains sockets installed in the cupboard. At some time in the future you will need to inspect the equipment and so a free socket, to allow a lamp to be plugged, in will be essential.