I totally understand you are hesitant to touch the 3.4%, but keep in mind you can always cash-out now, expand your portfolio, and refi down later.

Total rent between the three is $3200/month.I have an adjustable 20 year mortgage with a balance of $100,000~ at 4.95% that is set to adjust in 2026.I also have a HELOC on that property at $180K~ with a 9.75% rate. 

I will look at a few factors, rent for area, total mortgage payment with property taxes( which can be crazy in Detroit), investment in neighborhood, I like looking into places where they are building homes and apartments that attract young professionals or families , and also looking at potential to make a single family home into a duplex or something can add an adu or transform a basement to a studio apartment!

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

I forgot about Noiseaware. 

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

But, an LLC will not limit you from liability in total.

I would list the total number of BRs and try it that way.

I claimed for years 1) initial cash flow and cash flow over a long hold have a poor coupling 2) that I would purchase a property with negative initial cash flow.  3) I cared about total return and did not give a $hit about cash flow if the other returns produce an outstanding return 4) that cash flow is my least favorite return because it gets taxed annually. 

Total Investment $33,435.