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There are really only three main reasons for multiple connection server:
1. For high availability - so that the environment is accessible if a single server goes down
2. For scale - a single connection server today supports up to 2000 connections through it at a time
3. For different settings - you may not want the tunnel and PSG enabled on your internal connection servers so that traffic goes directly between client and desktops, but obviously would need these on for WAN access
If none of the above three apply then you don't need to do it.