Many would suggest against RE investing using retirement money but if you go into low risk opportunities it can be a powerful diversification method.

However, the most effective method is to simply tell the tenant that they'll need to provide proof of insurance prior to or on the day 1 of the start of the lease, otherwise the keys will not be provided to them.

Instead of focusing on move-in-ready rentals, consider fixing up a cheaper property (BRRRR method) to add value and boost cash flow.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

There are also people who swear by one method or another.   

You definitely want to use a thorough screening method like rentprep.com that gets their income, credit, background check, and call at least 3 references (make sure to verify them by address/job and then their name).  

Quote from @Renee Everett: Newbie female investor looking to learn more about the BRRR method to create a successful portfolio with my husband. 

I hope to find a single-family home with at least 4 bedrooms, use the BRRR method to turn it into a short-term rental property.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

He uses poorly thought through methods, I've listened to his "methods",  Thus, he has the high amount of  Due On Sale called in a short period of time.