[Question] Coturn cluster and load balancing.

I refered to https://www.ietf.org/archive/id/draft-zeng-turn-cluster-00.html

TURN LB: A device that performs two functions:(1)Ensure the load balance of all servers in the cluster; (2)Ensure that data from all peers of a P2P connection can be routed to an appropriate TURN server.

I have deployed two coturn servers with load balancer; it seems like they are working correctly.

Q1)
Then, when using a Loadbalancer such as AWS NLB or Azure Loadbalancer, How check LB performs (2)Ensure that data from all peers of a P2P connection can be routed to an appropriate TURN server?

Q2)
I'm wodering about session sharing. If there are two coturn servers with load balancer, how to session or allocation or channel sharing among the two coturn servers? Do i have to set something on config file?