You MUST be exposed to the MLS ... exponentially offering your property to all Realtors and all of their buyers.Nevertheless you can skip the Listing Side of the commission by going with a local Flat Fee Broker (Check licenses in your state) and you will be fine.Particularly in CA: get a Real Estate attorney regardless of what kind of Realtor you use.

Our question is: what cash-flow level should we consider too low for North Atlanta area and - therefore skip the property?

I’ve used PropStrean to skip trace and send post cards.

1) Look for recently sold flips and call the sellers. 2) Search for recent cash sales on propstream, skip trace, and call the buyers.3) Attend networking events 

There are also skip tracers out there that can get you data as well.

To answer your question, its going to go like this: 1) Address of house/houses you want to buy2) Find the owners, usually via a skip trace website or something similar, or asking around. 

I was wondering what is the best skip tracing software that you all have had success with?

I'm from there, and the only time I ever stayed at a STR was for my wedding night, in those days it was a "bed and breakfast".

Do quality tenants really skip over rentals without on-site laundry?

They are ruffians with neck tats, smell like diesel fuel, drive jacked up 4x4s and chew tobacco for breakfast.