Yeah, it's kind of interesting, in my current playthrough of mostly vanilla (added a couple of mods to start experimenting) before starting to try some of the megamod packs, I have bases that popped up in Portugal and Norway. I just stepped on the Portugal base, which was also turned out to be a floater base. RNG is funny. Now I'm curious whether it was in exactly the same spot as yours!
I haven't intercepted a supply ship on the northern base yet, to identify its race.