I'm trying to connet photon cloud using PEER class (not LoadBalancingClient)

Hi
I want to try how much can connect to Photon Cloud Enterprise (this is private photon cloud right?)
I'm trying to use STARDUST client to how we determine what CCU is fine.

As youwe know you can connect to photon cloud to master
loadBalancingClient.ConnectToRegionMaster("us");

Unfortunately, STARDUST is not using LoadBalancingClient but using PEER class.

so how can I connect to photon cloud using PEER.
(or photon sdk C# not PUN)

Thank you