Whilee I was studying and spent my summer holidays helping my parents (they were paying my education) I did turn off the fridge, clean it, and leave it open while I was away.
If I were going away for more than a few days, I would do the same now. It does not really matter whether you can reach the socket or not, as modern fridges can be turned off using the dail that alters the temperature, while the fridge is on.
I am not sure this is at all neccesary.
More worrying if you are away from home, unless a friend or neighbour goes in to check regularly, is the thought of a power cut knocking out the supply to the freezer, then coming back on and food that had been partially or entirely defrozen being re-frozen!
Oddly enough, none of us seem to let that thought worry us, although the risk of food poisoning from that kind of accident is much more serious than that likely to occurmif the fridge went off and then on again when the power cut was over.