If you are referring to Section 8 housing, that can be any apartment or house in the US.

However, if you're a W2 high income earner or business owner, I can't imagine it makes any sense to flip houses, mail mass post cards, wholesale, or build lead gen websites with the value of your time being better spent other places (such as learning about real estate and increasing your income through proven means), such as at your 9-5pm or growing your business, and your real estate is a long term process and you don't need "home run" deals to qualify or make it work.

At one point years ago, I toyed with the idea of owning giant apartment complexes in multiple cities.

If it discharges 5 foot from the building and there is a low spot running back to the building, then it is going down hill back to the building.

@Sean Dillon figure out how to buy a 2-4 unit with FHA loan.Then rent at least one of the units long-term for stable cashflow.Try STR in another unit as well as the other bedrooms in the unit you live in.You may even consider living in the basement, attic or worse unit in the building to rent everything else out and max cashflow. 

Jeffrey:I'm connected to a large group in Indy that focuses on buy & hold SF and apartment (commercial) residential real estate. 

If there are certain areas that you're looking where there aren't any four Plexes, consider building one.

This morning I evicted an inherited tenant in a building that I"ve now owned for just over a year. 

It’s just like having your 5 houses, only all in one building.

Build a team with all that time in the morning and and the time you have by walking up early etc.