I would focus on a different intent: intent of the anti-abuse rule and its reference to "a single unit of tangible property" in (6)(i). 

I live in one unit, rent out the other unit, and rent out the detached garage for storage. 

There are tenants living in the downstairs unit under a 1 year fixed-term lease ending October 31st 2024.

I normally advise people to self manage for the first part of their journey if they can so that they can get a knowledge base to become better investors.At some point if you get to enough units self management is tough and its too costly to hire an employee so the numbers make sense hiring a property manager.To be blunt, you are going down a risky path for an investor.  

4 units in New Haven for a new investor is going to be quite a bit of work.

How many units do you expect for your $800k-$1M, Class A or B MFR?

If you have professional tenants, there may be a benefit if they know you're the owner, self managing, and have less than 4 units.

Because we cannot do short term rentals in our area we chose to do mid term furnished in one of our units. 

I am currently at one of my clients/friends condo's in Waikiki I met them when i brokered a 100 unit apartment to them in Portland 20 plus years ago.. at the time I asked them if I should be shopping for a lender and the response.

You can buy these little meters that attach to your sub panel, if you want to know how much elec the unit is using.