So there payments are $200 - $400 dollars under market.

I still am on the lists of all the major wholesalers and still show up to showings occasionally on properties that might have enough margin for me but have not purchased recently from a wholesaler.Just like Adrien says, they provide a service of marketing and negotiating contracts for you.

I did market analysis to find the right rental rate.

With a HELOC being around 9% I'd probably be paying more in interest than the money would make in the stock market.

if so where do you market your listing? 

For example, you might choose to take a blanket mortgage covering all properties, BUT perhaps the market softens and later you wish to sell a property.

Have you had an appraisal done recently, or do you have comps to estimate the property's market value?

As for Raleigh, if you’ve already seen the success of Airbnb-ing rooms there, it’s worth exploring further, as it’s a growing market with plenty of demand.For alternative strategies in Greensboro, look into renting by the room, especially for professionals or students.

So, with a house hack you need to understand the rental market and your approach to landlording.