Out-of-state investors, do you recommend a reputable online source that provides crime rates and other demographic information of cities/zipcodes?

They have a great online portal for tenants and owners.

You can also check their reviews online at Google, Facebook, or Yelp.

Memphis can provide an excellent platform for that, with its combination of affordability, rental demand, and landlord-friendly environment.If you have any more questions or need further guidance, feel free to reach out!

We use QuickBooks Online exclusively for all of our REI Clients (including House Flippers).

I have found a few online but they all require a subscription or a payment to view.thanks in advance 

Check out other online guides available here: https://www.biggerpockets.com/guides3.

With buyers having online access to all listings it's pretty much impossible for buyers' agents to ghost a listing.

Depending upon the local laws, it may be possible that any similar property could be a STR just by a few clicks of buttons to post it online.  

Platforms like Rentometer and Zillow can give you rent data to compare properties.Networking Locally: Reach out to agents and local investors.