After BOTM28, it is very unlikely that we are alone.Without regard to the second question or the map type, I'd be loathe to pick a fight from a central location until I'm ready. There are a few exceptional neighbors...
Big and Small has a wide variation of settings, and the potential for the lack of an immediate neighbor.
Spoiler :
if we are, the AIs will probably have lots of space and be lovey dovey.