Miyoo Mini +

My mistake, I thought it was this one

According to the device reviews, lots of potential problems.

Yeah there's conflicting info, under USB it says "2USB3.0；2USB2.0"

Here's where I found it https://a.co/d/0lh60eRbut Amazon could be wrong too

I think that's a misprint. Looks like two of the ports are 3 and two of them are 2.

I was asking them to post their setup so I can evaluate their experience with regards to Proxmox and disk usage.

There is no way to get acceptable IOPS out of HDDs within Proxmox. Your IO delay will be insane. You could at best stripe a ton of HDDs but even then one enterprise grade SSD will smoke it as far as performance goes. Post screenshots of your current Proxmox HDD/SSD disk setup with your ZFS pool, services, and IO delay and then we can talk. The difference that enterprise gives you is night and day.

Yes you don't need Proxmox for what you're doing.

https://forum.proxmox.com/threads/2-node-cluster-with-the-the-least-amount-of-clusterization-how.140434/#post-628788

https://forum.proxmox.com/threads/consumer-grade-ssds.141190/post-632197