I think there are so many opinions on this, but I'll share mine.
I have just a few buy and hold multi-families and an airbnb in one of them. I spent hours pouring over this topic and got all the advice. The CPA says the LLCs are the way to go and the insurance company says the umbrella is the way to go...of course.
After everything was said and done, I just ended up going the umbrella route. It's under $300 for the year and provides 1.3M in coverage after the liability coverage on each of our multi-families. I did end up setting up an LLC for one of the properties, but sometimes the insurance company doesn't want you to double dip with an LLC and won't let you cover a property considered "commercial" with an umbrella.
My understanding is that unless your financials are PRISTINE, any good attorney can crush the wall of protection that the LLC is supposed to provide anyway. That's the main reason I just went with Umbrella coverage as our main protection. That and simplicity.
Good luck! Please share what you did, I would love to hear what you went with!