@Ben C.
Every State is different, but in general a Multi Member does offer a little bit, I mean tiny tiny bit more protection, but I think your over thinking it. Any LLC Corp Trust ect could be possibly busted with enough time and litigation. When you put your business in a separate entity, your just trying to make it difficult and expensive for someone to sue you. And make it so expensive and hard that its not even worth trying. In Florida, where I live, the only single member LLC ever broken was the Olmstead vs US. and that guy basically just set up an LLC to try and shield his personal property and pay his personal bills to hide from creditors. The court ruled his LLC was really not a business but an "Alter Ego" Even with this obvious fraud it still took the power of the FTC and Federal government to break the LLC. Unless you have multi-millions, it would not be worth an Attorney trying to spend hundreds of thousands in legal fees trying to crack your LLC, and even after they crack it they still have to win the case.
Set up your LLC
treat it as a separate business (no personal bills)
get a 500K liability policy
buy your flip and get going
when you get more than 500,000 in assets in one LLC open another when you get to 10 LLCs private message me and I will help you from there.
Hope this helps
Good Luck!