If all goes well, the WTR MAX should ship tomorrow, and now I'm trying to decide what OS or hypervisor I should install.
TrueNAS is an option. It's a good NAS but for all sorts of reasons, I rather run VM's and docker elsewhere.
Proxmox with TrueNAS inside is an option. Unfortunately, there is no guidance on running TrueNAS in Proxmox on the platform. No idea if I can pass a SATA controller.