

The safest and most flexible option would be to configure the BIOS to not use the RAID controller and just “see” the drives as a regular JBOD, and then setup a ZFS RAID-Z1 array and configure your zvols, etc. in that instead. RAID-Z1 is functionally very similar to old-school RAID-5. There’s virtually no performance penalty with software RAID these days, and you’re eliminating the proprietary RAID controller as a single point of failure.
FYI many credit cards will allow you to make virtual numbers which you can then use for individual purchases or groups of purchases. They were originally meant to help combat fraud but I use them for subscription services so that if they give me a hard time about quitting I can simply cancel the card number and file a dispute (which in my few experiences has always gotten me my “overage” fees back)