Hello,
If you're aiming for load balancing between two servers, there are two deployment methods:
a. Install only the session host on the second server and add it to a collection (also known as a farm) on the first server.
Note: The Connection Broker cannot be installed on the second server. This is the simplest method.
b. For High Availability in your RDS deployment, you'll need to install SQL Server on another server (possibly the third) and configure CB for HA on the second server. I generally don't recommend this approach as it is quite complex and requires an additional server.
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