Asset Protection for Rental Properties

[M Amin]

If you own several rental apartment buildings. Which is better way to legally structure the properties for protecting assets against tenant lawsuits.

Scenarion#1:

Have each property in its own series under Series LLC. Use Series LLC to handle management activities, including collecting rent and signing leases.

Scenarion#2:

Have each property is in its own series under Series LLC. Create a separate "operating" LLC to handle management activities, including collecting rent and signing leases. The operating LLC doesn't own any asset, just liquid cash that is rental income from tenant and expenses against rental properties. Could the shared management function create a "common enterprise" argument that might compromise the intended separation between series?

Is there a alternate way to structure it, please suggest.