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It's unclear how you are scaling your farm, but it appears you are relying on Terraform for that scaling. I would suggest that you use auto scaling groups instead. You can specify which AZs (via subnets) you spin up instances within: https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-in-vpc.html It is part of the service to keep the subnets balanced.
A placement group is to place instances physically close together for lowest latency between the instances. This is commonly used for HPC, Map Reduce, and other cluster compute applications. These are located within an Availability Zone: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
answered 2 years ago
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