Who owns the property, it is in your individual names? If so, only insurance will protect you from liability. I own a triplex with agency financing with my brother in our individual names. The leases are in our names and the rents is payable to us; we file taxes under a GP. I get a K1 and he gets a K1. We have good insurance coverage plus I bought a separate umbrella policy for $1,000,000 to protect my personal assets, premium is $300/year.
You can transfer properties from your name to the LLC but you will pay transfer tax because technically it is a sale, even if it is only for $1. And you will void your mortgage because in the note there is a "due on sale clause" and you will void your title insurance.
You can buy properties in an LLC, but if they are 1-4 units then they qualify for regular 30 year mortgages. If you buy in LLC's, then you have to get a commercial mortgage with higher rates and you can't get 30 year mortgages.