Spent years in the corporate banking world...did not love that.  

We are transitioning from Airbnb to corporate month-to-month rentals.

Will depend on several factors like the type of property, type of tenants, your risk tolerance, other assets you own, your estate planning, laws where the property is located, etc.Any lawsuits would be limited to the assets of the LLC and not your personal assets (assuming you run the LLC appropriately and the corporate veil is not pierced).

Not sure if it has a corporate income tax, but you can google that yourself right quick.

San Antonio Pros wise: We have relatively low costs of entry, crime rates are lower relatively in many areas of town, the city continues to steadily appreciate and is appreciating more rapidly in certain areas of town, the job market here is stable and improving as more corporations look to headquarter here bringing their jobs and increased local GDP, rapid population growth as you mentioned, plus the city is a great place to frequent if you're an out of towner.

Nevada Corporate Headquarters.

Should we each set up an LLC, do a multimember LLC, or perhaps form a Corporation?

When I had a corporate rental, I just used a word processor to type up an invoice and send it to them each week. 

I'm looking to build corporate credit with lines and high limit credit cardsfor my personal as well as business.

Also, you are more likely to build a relationship with someone in your home town, rather than some big bank or corporation.