It markets our properties, screens our tenants, collects our rent, deposits it into our bank accounts, has full accounting and reporting features, has a tenant facing web portal & app where tenants can log in and report maintenance issues and see their account, etc, for $2/door/month - but they have a $45 minimum monthly fee... so up until you cross 22 doors it would be $45.

https://www.renterswarehouse.com/rental-listings/39331Now on this listing an important feature to it is the size, not just of the property but the lot, the feeling of big, space, and of semi-secluded.

Before I got to the payment screen, they prompted me to buy a secondary course on Virtual Wholesaling at a discount, another $250.

I think different approaches are appropriate for different landlords especially based on the size of their portfolio.

If so, as @Brandon Weis mentioned, they come in all "shapes & sizes".You'll get more assistance if you post an example here and ask more specific questions about it:)

What are some companies that others are using to insure multi-families of this size?

As for why the US, simple - trust, market size, and access to information.

You're looking at real estate as if it trades on a screen.

Easy to screen, setup leases (I do my own), and collect rent for very cheap fees. 

So, the first question they usually ask a PMC is about fees - instead of asking about services and HOW those services are executed.EXAMPLE: PMC states they will handle tenant screening – what does that specifically mean?