Landlords should inspect their properties regularly and be aware of what's going on.

@Emily Anderson true on the flat 24% tax rate on rental income without the possibility to deduct costs from it.Keep only one thing in mind: rental income is being added to regular taxable income (salary and rental income).So I could deduct costs before ending up with taxable rental income, however for me, it is being added and calculated together with my salary income.That means I'm easily reaching higher tax brackets even after the deductions, while with a flat rate it always stays the same (even if you earn way more rental income).

I see these four rentals providing us a regular stream of income during retirement. 

Competitive upfront costs and ongoing subscription costsPlus 2 Nice To Haves: Good analytics reporting and Compliance Updates regularly communicated

The purpose would be to rent it out through a property manager just like a regular single family home.

I am a regular lender doing FHA, VA and Conv, but I also loan my own money privately, and pool money from other investors when I don't want to loan my own money.  

It's important to go there in person, at the very least do video calls if you can't fly out and be in regular communication with whoever is working on or managing your property.

Or is it a regular house in a neighborhood?

I'm a landlord of a 3 unit building and a regular check on it and clean the hallways lately.

Most of the other regular costs associated with the loan apply... appraisal, doc fees, county taxes, etc.