But, in the event you really are persuaded that it is important to separate each asset, ensure that whoever is managing the books/monies on the LLCs are doing it 100% correctly as even a small mistake can allow would-be litigants to pierce the corporate veil and render all of it in vein anyway. 

If you're interested in a Franchise; I would contact HomeVestors corporate office and ask them who the mentor is in your area.

The bipartisan Corporate Transparency Act, enacted in 2021 to curb illicit finance, requires many companies doing business in the United States to report information about the individuals who ultimately own or control them.

This has a lot of administrative overhead, the LLCs being disregarded entities may pierce the corporate veil.

What are best corporations or banks to use for this?

I had to take a break from my RE business because of my corporate career.  

NV Corporate Headquarters.

When I was working in the corporate industry, I began investing in real estate.

Plus, it simplifies the process of adding partners for future projects and helps keep your finances organized.As for BRRR, you can also deduct expenses and LLC income is reported on the owner's personal tax return, avoiding double taxation that corporations face.

If you're co-mingling your finances, you will have negated any liability protection a proper corporate entity structure could provide.