I would review your process with how these investments are going so far and figure out what's working and what's not.

My assumption is that there are a lot of bad apples, and very few that actually care about the seller.

I care most about the Internal Rate of Return (helps me determine how long to hold a property), the cash on cash return (helps me decide why this investment vs other options, and it also takes into consideration appreciation of the property!)

Is this pocket a value oriented area (most sq ft per dollar of rent) or will they care more about proximity to highways, retail, walkability?  

Yeah that is a huge pet peeve, but also could be AI posters who don't care or my even least favorite, didn't get the initial feedback they wanted so they didn't look again.

They are billed as "a scientific approach to single-family rentals" and use "institutional grade property management," which usually means they are a tech company in real estate and likely either don't have the existing property management relationships in each area or you chose an area where they don't have enough units through Roofstock for the PM they chose to care.

Happy to provide feedback in return and share one of the lead magnets we’ve recently created for review!

Beyond carefully vetting the tenants, how can an investor protect themselves from squatters if we want to sell years down the road?

Definitely tread carefully here to avoid any discrimination claims!

Focus on markets with strong rental demand and appreciation potential, and be sure to run the numbers carefully to avoid overleveraging.Good luck!