Encrypting Proxmox VE (Best Methods)

I have been looking for the best way to encrypt the Proxmox boot drive (one that is not using a hardware RAID setup). From what I have seen the most common way of doing this is over a Debian install with LUKS encryption. I have also found this method. Is there any advantage using one method over another?

Also is there any way of encrypting the VM storage drive/volume in a non-RAID setup? Is the preferred method to individually encrypt each VM when setting them up rather than the drive...

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