I have checked here and yes, that's right:
https://docs.microsoft.com/en-us/azure/container-instances/container-instances-region-availability
Have a try how the containers work asynchronously and what the requirements of a container instance are. Describe these inside the docker-compose.yaml under deploy section and try deploying to the group. Note that containers are designed for minimal units or services. You should monitor the performance once deployed - use Azure Monitor to get the exact usage metrics. I believe the deployments will fail if there are not enough resources available for the next containers deployed:
deploy:
resources:
limits:
memory: 4g
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