I have done this method in the past and seems to work just fine in most situations.

It does not matter what the membership structure of the LLC is. 

That discussion is still open as I am stil not sure how to structure the partenership so I benefit from teh tax perspective.Your advices will be much appreciated.

I'm a veteran as well and use the BRRRR method (out of state), it's EASY.

These are all things that would influence how you would structure this.For example, if you're looking to sell your brokerage soon, I would recommend carving out your commissions from the overall company income. 

No structure of a temporary character, trailer, tent, garage, or outbuilding shall be used on any Lot at any time as a residence either temporarily or permanently.What’s your understanding of this bylaw as it reads?

I am looking at using flipping and BRRRR methods for my own personal REI.

We structured a deal where she takes an additional fee for managing the process.

My problem with the 3rd (and easiest for the landlord) method is that could end up being quite a few people who don't have a chance of qualifying that end up paying a non-refundable background check etc fee. 

Nope, for the most part you have to look through all the listings like everyone else, but many search methods will let you filter for short sales, and agents can filter for short sales, probate, REOs etc.