@Josh Smalley
Welcome to BP! Although I've been on BP couple of years but I don't have enough RE experience to contribute much on for forums. I'm just sharing my learning and experience here.
I bought a few out of state properties (and some of which are turnkey) in the last 5 years. I can't say that they are truly passive like buying stocks or mutual funds because you will have repairs, tenant turnover/placement, and other issues which a great property manager should take care for you. You will also need to track your rental related expenses / income for tax reporting purpose. Depending on where you purchase the property, you may also need to deal with unreasonable property tax assessment and find ways to get reassessment done in time to lower your property tax.
That said, like @James Wachob said, the key is to have a great team that you vet and trust to handle your properties while you're thousand of miles away.
Other than buying rentals, there are other options to invest in RE like what @Larry Fried wrote in his blog, or invest in REIT (Vanguard mutual fund or other ETF's), private money (loan people and receive interest like a bank), notes or note funds, crowdfunding sites, JV apartment deals and other alternatives that I don't know about. Know what you are looking for, what you can't handle, why you want to invest, and compare some of these options to understand the pros / cons (liquidity, control, fees, to name a few) before you decide.
Good luck figuring it out.
Henry