Something else I found with BRRRRs in my market right now is that even if my equity may be enough to cash-out everything I put into the deal, the rent I could get would not cover that high of a mortgage.

The underwriter of your loan may want to see your current property be leased and make sure that it covers your PITI, but that will depend on the guidelines of your lender.

In Milwaukee, look into networking groups like the Milwaukee Real Estate Investors Association (MKE REIA) lot's of different approaches covered including wholesaling and flips, or if you decide on buy and hold the Rental Property Association (RPA) of WI is great.

Then you may be subject to the eviction moratorium, but then again you may not. 

Otherwise with no income you are looking into just buying all cash or using a loan called Debt to ratio income to purchase investment properties where you use the rent to cover your mortgage but you will need to put down at least 25% down of the purchase price.

ya absolutely. most people just recommend multi family because it allows you to offset your income while living there without having roommates. also they tend to cash flow better so if the plan is to do this year over year making sure the rents cover your DTI when you move out is very important.

A solid understanding of the rules can open up opportunities you didn’t even know existed.House hacking can be a powerful strategy to build wealth while covering your living expenses, and incorporating advanced strategies like 1031 exchanges can help you scale faster.

You must however make enough to cover the note on 2 properties because there will be times when the rental is not occupied2.

If you don't, the next seller (ie the person buying your flip) will have an inspection done and then ask for $ to cover a new septic. 

Since you've already covered three treatments, you could offer a good-faith rent concession (e.g., a one-time reduction) without admitting fault, which might maintain a positive relationship with the tenants while protecting your interests.