If you are wanting to live in the same building as the business, then yes, the Outer perimeter would be the only option
in Etzos proper.
But you CAN have the business in the main Commercial ring, and
live in the Outer Perimeter.
Otherwise, the outlying cities are a great option.
They can all be considered be uniformly of low-to middle status, other than the homes of the city officials.
I'm not sure what you mean by the link being dead.
Do you mean the
Map and the List topic didn't work?
Inside of that topic, each spoiler gives just a brief rundown of the town, which is then very much open to development.
If you have an idea for a business, and a town in which you'd like to see it placed, but the overall "theme" of the town doesn't seem to fit, do not worry, I'll make it work. Just let me know the details.
Now I realize, that, after Highbend, everything is just a copy of the Darington info.

My bad.
Everyone seemed so satisfied with Foster's landing that I was not greatly motivated to fill in those other blanks.
After the events of
The Fiend Unleashed, Southguard is rebuilding from massive death and destruction.
But the others -
outside of Lakewatch, which is not known to exist - would be fine with a new biz in town.
These little spoilers and not meant as forums to post threads on though.
You would simply post in the main "Outlying Cities" forum, with tag included to show which city the thread takes place in.
I hope that helps. Any further questions or details can be PMed to me. Like what sort of business you have in mind.