Note: I'll caveat: I believe that other factors should be considered when analyzing the market as well (i.e. economic growth/stability, low crime rate, affordability, etc.)

I know Virginia Beach is attractive but that average price for Alexandria strikes me as rather low.

okc market is at historic lows for leasing(especially September) it has picked up some in Oct. 

Access to MLS is one of the best reasons for investors to get their license since it's such a low bar to entry and low annual fees for that and access to all dumps on the market.

The return on equity is probably very low considering they are paid off so maybe explore refinancing or selling the lowest performing one(s) or your biggest headaches to reinvest in more lucrative deals.I noticed you also used a metric of number of rentals to attain your goal rather than $$$/month.

If low wet ground check with people moving dirt for free fill dirt.

And Sec8 sounds great, but comes with it's own issues.Add it all up you get a low dollar, but high headache strategy, which is a challenge that gets amplified, especially when you are operating remote.

.: EM doesn’t seem extremely low, just kinda low.

It's crucial to choose a market with steady job growth, low vacancy rates, and tenant demand.

@Aaron Zimmerman HubSpot is a great CRM to use at a low cost.