In other words, I already have a checking and savings with BoA, but I would create a 2nd savings account (within my regular account) and put all the rental properties last months and security into that account (combined).Is this the correct way to prevent co-mingling of funds, or what would you recommend?

We deliver our properties free of both (noted as such in the lease) and then contractually make the tenant liable for prevention/termination. 

You might ask about a backflow preventer on just the tub.

Quote from @Makan A Tabrizi: Quote from @Marcus Auerbach: We try to get ahead of the issue by preventing it in the first place.

I really like OKC but it has tornados that kind of prevent me from looking further. 

Having a rock solid SOW can prevent many of the issues that arise during any project.

If not, there is a legal reason preventing them.

There are no restrictions preventing out-of-state investors from purchasing rental properties in Texas—these investors enjoy the same opportunities as Texas residents.Additionally, the financing restrictions you mentioned don’t align with reality.

Moreover, it allows you to set the terms of the lease agreement according to your preferences, which can help prevent misunderstandings and disputes in the future. 

If you do end up segregating, keep good records to prevent having to recapture the depreciation of the reclassified assets.