I don’t know of a list for the fastest growing place for rental properties.I like Pittsburgh.

From the little I know, Lehigh Valley is one of the fastest-growing economies in PA.

Now, having said that, given your stated financial situation, your fastest path to cash is contract assignments which can be done anywhere in the U.S. with no money or credit or clearing titles or going to closings while using nothing but a computer or iPad.

It ranked McAllen as one of the fastest growing small cities (categorized by population).

Almost all of my tenants have been with me over 5 years, and the rents just keep going up.Interestingly, there was just a news story that came out yesterday that said the Stockton/Lodi area was the fastest growing in the state: https://www.usatoday.com/story/money/2019/04/22/the-fastest-growing-city-in-each-state/39362311/

WiFi can travel 300 feet or more depending the the radio in the router.

Growing population (had fastest growing pop. of any city in Alabama)- Strong rent growth, vacancy fundamentals.

I would tell you to continue to leverage your W2 job and move upwards in those ranks because it will be the fastest way to have excess funds to further leverage your real estate aspirations.My wife and I self managed 20 rentals while each working a full time corporate job.  

There is one thing you are worried about and that is...Making money.And the fastest way to make money is leveraging the skillsets you already have...not starting from scratch in a new industry like REI...or any other industry.Most people have no idea what it takes to be successful in this industry as I can personally tell you I quit my job way to early.

Doing the BRRRR strategy seems like the fastest way to scale, but if I refinance to get my money out the mortgage payment would be higher than if I just do 20% down plus repairs.