We use peered VPCs at work. We have a central account per environment that has the VPC that's shared to all the other accounts in that environment for databases

We use peered VPCs at work. We have a central account per environment that has the VPC that's shared to all the other accounts in that environment for databases etc. To be honest, I'd probably prefer a single account per environment. But managing the IAM for that would be much more work.