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FromTheRafters

explained on 9/3/2016 :
I too had heard or read somewhere that the outlet grounding lug position
should be on the top so that if anything was to fall on something plugged
into the outlet it would hit the grounding lug rather than having a 50-50
chance of landing on the hot lead. This supposedly made it safer.

Electricians wiring up rooms in a supermarket here in New Hampshire
told me that when I asked them put them upside down. I thought it
rather odd at the time because many three pronged plugs which lay sort
of flat against the wall when plugged in now have the wires exit the
plug straight up which puts strain on them.