Just a word of warning about this,try and get sockets for appliances in cupboard next to appliance as its a pain trying replace a fuse if you have to dismantle a built in appliance to get at it,also some appliance service people like to take plug out before they touch anything,just a thought to avoid grief later.
Agree with phil. In fact, most built-in appliances don't have room behind them for a socket anyway so they have to be behind adjacent units (with cutouts to get to plug/socket obviously).