Additionally, is it reasonable to request the current leases and what I believe is called the rent rider form (please correct me if that's not a real thing) prior to making an offer?

Additionally, checking local listings on Zillow or Craigslist can help fine-tune the rental rates in that specific area.

Does it require any additional rehab costs? 

They're probably fine with you paying for additional marketing as long as they aren't cut out of the deal.

Also, make sure there aren't additional restrictions on the property condition, compared to a conventional loan. 

I'm out in Denver but have family in NC and from what I've seen it seems like a fantastic market.In addition, if you house hack there are programs like NACA that will help you qualify. 

I own my own house and I own some land out of state, so I have assets I want protected.I have quotes and will be purchasing an insurance policy that provides 1 million in landlord liability and I can also purchase an additional 1 million in an umbrella policy.My question is, is it even possible, or has anyone heard of a landlord getting sued and losing over $2 million on a simple duplex?

Start with a list of cities with a metro population greater than 1M, and evaluate each city against all the additional criteria.

Aside from that the biggest value add areas I see are as follows: Kitchens, Bathrooms, decks/patios (if added), additional rooms/bathsKitchens and bathrooms tend to be the go-to, but all of those can help you get the most bang for your buck. just keep in mind that if the area is already of high quality, then it may not be the best area to spend the money vs something that is blaringly in need of an update.

As a result, I’m uncertain if any of the properties have illegal additions or modifications.