There are recommending screening companies on there that you can look into to see what best fits your screening needs.  

You might check with your Self-Directed IRA Trust Company/Custodian, they might have a brokerage connection capability where you can setup a brokerage account tied to your IRA, then you can with that brokerage to invest in various public market investments, in some cases stocks, mutual funds, ETF's, treasuries, and CD's.

If there is a mortgage on your primary residence and you are trying to deed your primary residence property to an LLC, you will need to check with your mortgage company if they allow it.

Could you recommend a trustworthy and cost-effective company for this? 

However, if you're okay with some cash flow but AMAZING appreciation potential and the best macroeconomics, I would look into the Columbus Ohio market as this is where all of the population growth, job growth, and companies moving/developing here (for example Intel, Google, Amazon, FB, LG, Honda, Nationwide, Anduril, etc).

But as someone who’s been in the trenches of real estate investing for almost 30 years, I continue to see some flaws.Some of the flaws I have witnessed are when tech-driven companies seem to lack backing from experienced underwriters or seasoned real estate professionals.

Looking at this past week's CMI, it's interesting to see the buyer/seller positioning in the SE-ish area compared to the NW-ish area with rates high 6's in JanuaryStill bullish on W/NW future demand due to TSMC factory and other companies (dashboard snapshot below) but time will tell.

Especially public companies. 

There are specialty umbrella companies that don't require you use them for car and home.2.

Think about an HVAC, storm damage, paying for housing if a tree falls on the roof, dealing with stupid insurance companies, etc.