I was in a similar position with enough qualified leads that I needed someone else to help me efficiently service them. 

You may want to calculate the parity in the interest that you would pay with what you would save to ensure you win with the deal.

Finally, you can always go to HUD and report them, so if you make clear to them that you know that they seem to be more 'earnest' about ensuring the rent is paid.

I am trying to figure out the real motive of doing so – is it multiple owners with some of them leaving or owners reducing their investment or some other reason…2) Since I will end up owning only 10% of the doors how do I ensure equal marketing as the doors are still part of a single complex?

You get into a much larger asset that allows for a certain scale and efficiencies typically not seen in single families. 

What would you say would be more efficient?

Another we bought had a 30 yr old furnace & when we were made aware of the high heating costs the two old ladies (lived there 14 years) were paying we offered to install a new HI Efficiency furnace & raise the rent $225/month. 

But with the platforms we have, we self manage quite efficiently and have had zero problems that were caused or exacerbated by this distance.

I like 15%, but with an 8-unit that's all one building, no basement, you will start to see some efficiencies of scale.Insurance is too low.

We could end homelessness tomorrow with this, all the while ensuring you don't lose your own properties do to a sudden loss of rental income from the main house.