From a physical vacancy standpoint, an 8.333% vacancy rate implies that all units turn over every year, if the complete turn (old tenant move out to new tenant move in, including cleaning/repair/marketing time) takes 1 month.

Physically check each one, yourself or hire a PM or maintenance person to do it.You can take the handle off each hydrant so it can't be easily turned on.

Perhaps not physically but mentally I've gone leaps and bounds.

This fits in 1% rule but not 100% confident.

What important questions should I include when deciding if one is a good fit?

It is a very big, diverse field and you need to find what is the best fit for you.

You could also try partnering with somebody or investing in notes or some other form of REI that may fit your investing style a bit better.

RealCrowd and RealtyShares were each impressive too, but they're not allowing development deals at this point so there wasn't a fit for us.

Continue shopping around for one that fits your business model.

Its not one size fits all.