So much good advice here already, but I'll add my two cents. As others have said, you're unlikely to get immediate, passive cashflow in any of those markets (certainly not Austin, where I work and invest) unless you plan on either 1. putting a lot of money down, or 2. doing some type of value add. On top of that, as has also been mentioned, it'll never truly be "mailbox money" because you do still need to manage your property managers, especially when it comes to capital expenditures.
My personal investment forte is 2-4 unit buildings, and in my opinion they are by far the best asset class for new investors. They're classified as single-family for contract and loan purposes, but have a lot of cost savings that translate into higher returns. The only issue is that they're usually clumped together, meaning a lot of small time landlords dictate how the neighborhood develops, and naturally most renters are not going to do extra maintenance for someone else's property. Still, over the 10 years I've been doing this they've moved me from a 70ish hour a week office drone to someone who is fully financially free. I still work a lot, but it's things I enjoy and am passionate about, and the value I provide benefits me personally, not some boss somewhere.