@Chris Alford
I’ve had good success with 2/1 in rural east Texas. Typically these units rent quickly for $600-$700. Here is some suggestions on how to confirm market rent. First look what similar units are renting for on Zillow, FB market place and Craig’s list. Smaller markets really don’t show up on Apartments dot com.
Second is to call your local housing authority. Ask for the HUD voucher rate for properties similar to yours. I've found they are super helpful with landlords as there is a shortage of units. I would consider the HUD rate to be the bottom of the market. If something is renting for less than HUD then there is something wrong. Either the property is way under market or it is a complete dump and doesn't qualify for HUD. You don't have to use HUD if you don't want to. I mainly see then as a good benchmark.
Now that you have a good idea of rents you can more accurately underwrite the deal. I once underwrote a six unit 3/1 based on HUD rents. Unfortunately I didn't get the deal because of flakey seller.