Regarding best practices for your PaaS container design, you should make sure that you find all the required parts for a solution at one or many public cloud vendors. If we set the networking connectivity with good performance and low latency, for example, there will be no need to, place our container hosts in different environments to provide better availability for customers consuming the cloud services. For example, if a customer is consuming his cloud services from Azure, it could connect to your service within the Azure backbone. If it comes from Amazon Web Services, this may be its connectivity target.

Bear in mind that redundancy requirements cannot be solved with more complexity. Even here, Terraforms can help to design a descriptive language that is cloud independent.