Looking for best way to show overlapping clusters (like a firewall spanning AZ1 and AZ2 but not containing all nodes).

[dantheman67]

I saw a post that had a solution but it used exact 'pos' attributes. Was wondering if anyone has figured out a better way to do this (https://lightrun.com/answers/mingrammer-diagrams-clusters-on-top-oflayered-across-extended-other-clusters). The blue box in the image below is what I'm trying to do. If this feature exists I could automate all my 50+ architecture diagrams at work. Thanks!