Where I live the requirements are essentially 2 exits, ny state energy code for insulation (R21 or better) and it must be able to stay above 68 in the winter.

I would rather have Remax manage my property and concentrate my energy on finding my next deal.

I need a more reliable way to find infill land to build our homes.

Rently is fine for the basics, assuming they have fixed their reliability problems.

TransUnion does provide a resident score, and after years of using their service, I've found the resident score to be quite reliable.

If yours is the only STR within 20 miles and there aren't any cities or larger towns within a 20-30 minute drive, you could easily run into trouble even finding a reliable cleaning person, let alone a full-service STR management company.I would also definitely take the time to find some comps on Airbnb in the same area as yours, with as close to the same bed/bath count as yours, and with the same finishes and amenities as you are planning to put in yours.  

Is there an efficient and reliable way to figure out what neighborhoods are Class A/B? 

The question is do you want to spend the time energy and money to find something that you think can do better?

Data center development companies, in general, will build their own energy infrastructure with transmission (not distribution) infrastructure. 

So while 50k is probably enough to get you started in real estate, it is nowhere close to being capable of generating that kind of reliable income without serious growth.