The Lock Store and the Tracker store serve different purposes which you can read about in the docs. If you want, you can use the Redis container as your tracker store as well by connecting to the RedisTrackerStore in a different database than your lock store, or you can use one of the others as you see fit.
How I can force each rasa server to connect to only one and different Redis Lock Store? Which parameter will let me enforce this?
I’m not sure what you mean by this. All of the Rasa servers should connect to the same lock store; otherwise it wouldnt be able to serve its purpose of keeping all of the servers in sync.