Wouldn't buy leads from them. 

I'm an investor in short term rentals as well as flips.

You could also bring on a business partner that specializes in sales/marketing to lead that side of the business

You can learn to do this independently or get a rockstar REALTOR to lead the way.

and whether these would be short, medium, or long term rentals.

Layer on the ability to invest the funds that otherwise would go towards the down payment and transactional costs and you likely come out ahead in such a short term horizon renting.

Hi All - I found a lead on a MFH (5+ units) that is a short sale.

Then tell us the nature of your remaining questions and concerns as to each remaining aspect, so people can have intelligent, focused, SHORT, conversations with you on each issue you present. 

Anyone have experience with a short term management company called BNB Monthly

The other is a full day drive, or a short/cheap direct airplane flight and we have family that lives nearby.