You can do LLCs or you can do an umbrella policy... it really depends on how many properties you have. 

Account ClosedFlipping houses in an IRA has the potential to create tax liability inside the IRA through UBIT if done regularly.If you take an early distribution from a Roth IRA, the initially converted basis can be withdrawn tax-free, but any income above the basis will be taxed as regular income plus the 10% penalty.I would not recommend this strategy.A self-directed IRA is a means to diversify an IRA for long term wealth building in a tax sheltered umbrella. 

@Will Grabert Agreed an umbrella policy in addition is necessary.

Four properties in my personal name with a 2 mil Umbrella policy.

They also didn't have an umbrella (another wealth coverage) (I bought one the next day).To date she hasn't had a suit come her way however she could get sued as many as 5 years after this event.

Focus on the things that put money in your pocket, not things that take away from it.But always get an umbrella insurance policy; that's your best form of protection there.If you're still wanting to get an LLC, I'd recommend @Scott Hildebrand. 

Please be aware that the information you find on the internet is worth exactly what you pay for it.The only reason you would setup a LLC under the umbrella of a Solo 401k is if the SoloK was significant in size and holds a fair amount of both risk and non-risk assets. 

However, my current priority is not liability protection as we (my spouse and I) only have one rental at the moment and do have an $1M umbrella coverage.

Unless your equity in the property is exceeding several hundred thousand you may find that its not worth it and a simple umbrella insurance policy is the better option for you.

That’s fun to do and fun to get all that cash out right away to go get another deal with cash.Do you have any special type of umbrella policy?