I got it correct, although I would like to know if this alternative is ok too? - "Er wohnt oben mir" ??
oben means up, which isn't relative to anything, it just describes a very general place that is upwards. so you can't say oben mir / up me. But you could say Er wohnt oben / He lives up(stairs)
In addition to Paralars1: You could say: Er wohnt oberhalb von mir.
Why is Er lebt über mir incorrect?
I don't see why it wouldn't be correct, I reported it
Why is it mir?