As a result she does not have to pay any taxes on her W2 income.Now I summarized it a little and he notes that he is giving a simplified example.

Eventually select a market you can focus on otherwise you will be all over the map and you need to simplify things when you are learning.  

I would love your advice on the best way to set up a LLC to protect my 6 SFH rentals while keeping accounting and management simplified. 

Without recreating the wheel, who has simplified, or wouldn’t mind sharing their methods, softwares, marketing tactics, etc...Looking for specifics i.e: 1.

That is way over simplified, but do you get the idea?

Note: I'm not doing this to limit liability, just to simplify a somewhat messy reporting approach.

It seems that this will simplify my life a bit. 

That can simplify some of the issues that commonly torpedo partnerships/LLCs.

I meet with the mother (80 years old) who had been living in her house for 50 years and just wanted to leave Miami and go up to Alabama to simplify her life/surroundings. 

It allows him to keep control of the deal and greatly simplifies taxes and legal.If their arrangement is true sharing, which includes both profits and losses, then indeed it's a partnership which opens a Pandora's box of tax, legal and purely operational complexity.