Wow, I never knew they could be installed that way; the US standard doesn't say. Now every time I see a new outlet I'm going to check.

Or have sensible outlet design where prongs are always recessed.

This is why you have modern circuit breakers.

How does that help?

... it was an ungrounded plug... Plus it was a chain, so it'd drape across all 3.

TBH, in the house I mount them ground down, but under cabinets or in the garage/shop or etc I mount it ground up.