DSCR.......check it out

You need to check with the PM company to see what they allow.I'd not do this because:You have to wait your turn for a booking.You  are at their mercy as far as rules and fees.Regime fees and special assessments can kill your net income.A SF beach house will make more money without the HOA fees.Condos are a dime a dozen in Myrtle Beach so you can rent one cheap due to all the competition. 

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

Check out some CRM's that provide you with a phone number to use. 

Do you recommend a background check and credit score check site ?

In the bad old days of double digit mortgage rates an acquaintance of mine used to pay full price for property mortgage free and have the owner carry back 95% in a no interest 5 year fully amortized loan.  

Definitely start off with an LLC and maybe even a double system of a management company over an individual LLC owning a property worth $2ook or much more, maybe even through in a trust or 2 to make a lawsuit have to look to even find you. 

We just last week sent out leases and rent increases with a schedule to get them all up to FMV by next year, which is more than double for most of the properties.

Firstly that check is heavy 😂. 

I would check with a credit specialist as well as your loan officer.