But, for non-QM or DSCR products every different products make up there own rules and there 100's of them in the market place.

Its a full-service marketplace that purchases under-market properties, manages the renovations on your behalf to get them rent-ready and then manages the property for you for the first year post-closing and beyond if you need them to.

Some post here on the Bigger Pockets Marketplace.

The only platform to buy and sell these is their own marketplace here: https://www.lofty.ai/marketplacethey send out property updates, repairs etc, via discord channels.  

Facebook marketplace as well. 

For starters, make sure you are working with a TK provider that is not just going to tell you all the pros of the marketplace and their company but also all the risks associated with the marketplace and all their weak points.

We tried FB marketplace, but the leads weren't very good, and my account got suspended for 'suspicious activity.' 

I wouldn't exactly call them wrong numbers, but it does require a little more detective work to track down your target if the only number you can get to pick up is a work number or a family member.  

The builder says it is fixed (the builder patched the roof, replaced a tile, dried the walls using fan), but the leak detection test still identified elevated moisture levels in the walls and they couldn't pinpoint the source of the leak (There was no leaks in the pipes)

Facebook marketplace is a great place to find potential tenants.