-Will it be robust enough to track additional business expenses that are NOT tied to a single property (IE; Business insurance, Home office, ETC?)

The first is  single story 3 bedroom 2 bath, the second is a two story 3 bedroom 2.5 half bath.3.) 

Keep this to a single page.

Until now I've focused on distressed single-family and small multi-family properties for rehab into rentals (BRRRR).

On a side note, oddly, the tenant before her was also a single woman, around the same age, stayed in the apartment for 10 months, no communication or heads up, left around the same time of the year.

I have my primary property which is a single-family house that I house hack.

If I remember correctly, there is a provision for properties with Fannie and Freddie loans to be moved to single-member LLCs after 12 months of seasoning if the only member of the LLC is the owner/borrower on the loan. 

I've done 7 myself and lived for free or better in every single one.

Fifteen percent IRR is possible, and single digit cash on cash is achievable. 

Not one single example, yet everyone pushes it like it's the ultimate protection policy.As stated above, the best protection is to follow the law, treat your tenants honestly, and document everything.