As @Bryce Cutler mentioned, CRREIA is a great meet up.

Simply be a calm stand off landlord who is expecting his tenants to honor the lease - Not you accommodate their personal situation.

At death, the property gets a stepped up basis.  

As I read your post, the reoccurring theme that came up was a screening problem. 

I'm not a fan of flipping simply because I hate paying taxes when I don't have to.

STR management is 20-25% (I would recommend self managing or getting a VA), since income is higher you could probably get away with 5% for maintenance / cap ex but remember you need to cover utilities and cleaning for these units which drives up costs.

@Melanie P.I need to unpack & clear some things up from your last post for Bigger Pockets viewers.

Have contracts or covenants that keep newer homes there and keeping yards clean.  

Sometimes emails go to spam and simply some people just don't check their email religiously like the rest of us.

It is just a job, not RE investing.Save up and buy your own place to Truley create wealth and not just make an actual owner money.