Do we need to launch n+1 EC2 instances with ArcGIS Enterprise Installed, with different license keys? In the example below are the machines configured as standalone EC2 instances with unique keys for ArcGIS Server and added to the ELB? Lastly, can we run CloudFormation for a previously configured EC2 ArcGIS Server and add the new instances. Right now our set up is a single machine ArcGIS Server Enterprise Advanced on EC2. The end goal is to autoscale this instance based on CloudWatch and have this instance and any other under the ELB.