Doubts about using system files for different disk partitions

[Anima00]

Good day, everyone!
I need to install Proxmox VE on a DELL PowerEdge T550 server with a Dell PERC H755 SAS RAID card. The server has two 480 GB SATA SSD disks and four 960 GB SATA SSD disks. The idea is to mirror the two 480 GB disks on which I will install only the Proxmox VE virtualization system and use the remaining 4 disks as storage for the virtual machines. My question is whether to use ZFS or EXT4 for the Proxmox VE partition on the two mirrored 480 GB disks.
Personally, I am leaning towards the EXT4 solution for the Proxmox VE partition on the two 480 GB disks in hardware mirroring configured on the Dell PERC H755 SAS RAID card and EXT4, and using ZFS for the remaining 960 GB disks to be used as storage for the virtual machines.
For the storage of virtual machines on the four 960 GB disks, I will use ZFS configured with RAID-Z1. Are there any contraindications or lack of support for the RAID-Z1 configuration on four disks? From what I have read and heard here
https://www.youtube.com/watch?v=_EK8Ep7geKg
there should be no problems.
I know that ZFS does not support hardware RAID, so I will configure the 4 disks for the virtual machines on the RAID card in “NonRAID” mode. Is that correct?

Thank you for your time.
Bye and thanks!

 

[MarkusKo]

If the "NonRAID" is HBA mode then yes.

I would go for ZFS mirror (like RAID-10), not RAID-Z1 (like RAID-5) because that will perform way better.

Are this enterprise grade ssd's? If you use consumer grade ssd's ZFS is not a good idea, then you probably should stick with hardware raid and LVM Thin on top for your VM's.

*update*
some more info about zfs