My nas is a low powered atom board that runs unraid.
My dockets run on a ryzen CPU with proxmox. I don’t have a cluster, just 1.
In proxmox I run a VM that runs a all my dockets.
I use portainer to run all my services as stacks. So the arr stack has all the arrs together in a docker compose file. The docker compose files are stored in gitea (one of the few things I still run on unraid) and Everytime I make a change to the git, I press one button on portainer and it pulls down the latest docker compose.
For storage, on proxmox I use zfs with ssds only. The only thing that needs HDDs is the media on my unraid.
When a docker needs to access the media it uses an NFS mount to the unraid server.
Everything else is on my zfs array on proxmox. I have auto zfs snapshots every hour. Borg backup also takes hourly incremental backups of the zfs array and sends it to the unraid server locally and borg base for off-site backup.
The whole setup works very well and it very stable.
The flexibility of using proxmox means that things that work better in a VM (HaOS) I can install as a VM. Everything else is docker.