I had this problem before with my house.

Were you using Propstream and Batchleads primarily for fix & flip and brrr?

You are exempt from the "source of income" protection though, which means you are allowed to deny an application just because they have a housing choice voucher, which would not be the case if you owned more than 4 units. 

Issue 1: I own a 1.3 ac commercial parcel in Fallon, NV which has zero inventory available and desperate for housing.

A good option to get your foot in the door might be to house hack and rent by the room.

I've heard of some hosts adding to the house rules that the guests must complete those steps after booking on the OTA platform, otherwise the booking will be canceled.At my company, we don't do background and credit checks for OTA bookings, but we do ask why they're renting a MTR and who will be staying with them.

I wanted to have a strategy if/when I plan to buy the next house.

I am a current house flipper and looking to start converting into more passive investments and am really interested in the note investing concept. 

I also have a 240 sq ft house that I do an LTR out of.

Paying more only on one can give a chance to get the other house potentially refinance if the rates go down.