Where’s the fun in paying someone else to do it all for you?
MergerFS+SnapRAID will give you a very similar set of features/flexibility compared to UNRAID storage. OpenMediaVault has native MergerFS+SnapRAID support and can also do ZFS - I would look at that for a comparable alternative. Otherwise, I’m very fond of a Proxmox host with a TrueNAS VM for ZFS pool management, or just managing the ZFS pool with the Proxmox host itself through this cockpit extension.