My recommendation would be to get approved as a Landlord, contact the director's office and request that an inspection be completed before a tenant is selected (sometimes they will do this as long as you select a tenant within 14 days - which you want anyways), and have an online application and screening resource in place.  

It all depends on the work you/your clients want to do to create value and the overall game plan.

Having the ability to offset their mortgage with an ADU would be a game changer. 

Quote from @Zach Howard: Quote from @Jonathan Greene: If you are looking at properties in the US only on Zillow, and not seeing them in person (I know you are in Hong Kong), this is just an effort in futility because you can't underwrite single-family or small multifamily deals only online.

I couldn't find much information about them online besides their own blog posts and a few interviews with the founders, who were promoting MHP business and themselves. 

Huge game changer for Investors

Investors only receive a share of the income you actually generate, you will not owe a fixed repayment block.Difference here is that this model is for owners who either don’t want to take on more debt, can’t qualify for the financing they need, or have little time.At best, this is word games. 

They claim to market on dozens of online channels, and they seem to know the right amenities to feature, have great design, services, experiences etc.

I still get junk leads but that is to be expected on just about every online lead platform.

You can also check their reviews online at Google, Facebook, or Yelp.