How to protect my paid off rentals?

[Nina Zou]

I currently have 10 units, 4 paid off. 

I have enough umbrella to protect them. Since they are all under my personal name currently so lawyers will be able to find them easily if there is any lawsuit against me.

So what is the best way to minimize the exposure of my assets to the potential liabilities?

LLC?

Land Trust?

Or my current umbrella is enough cos 10 units are too small to consider all of those things?

Any suggestions pros?