This guy's done it and talks about it a bit in this interview.
https://www.biggerpockets.com/renewsblog/bp-podcast-211-investing-out-of-state-rentals-notes-with-bob-malecki/
I think he said he doesn't mind people messaging over on the BP forum so that could be a place to start.
"I own 4 houses in my roth IRAs. I paid cash for them. It's been going well. not really that tricky, you just have to be sure to pay all expenses out of the ira. You have to have enough for unforseen issues. You have to pay for tax bill and insurance bill from the ira, not personally. you have to believe that the rent from the houses combined with appreciation will grow faster than the market will, or it's not worth doing."
In an asset market where everyone is chasing income, it only makes sense to buy when the assets are on sale. Buy your rentals as taxable investments when they are priced to produce ample cash flow. Don't buy when they are not. With all the tax benefits, you will pay very little in taxes if you structure your purchases correctly. IIRC, Arebelspy is collecting a nice income, paying close to zero income taxes because the expenses, including depreciation, are about equal to the income.
When I start seeing articles and podcasts like this, I know the stupid money is jumping in and it's probably time to sell....