Hey dumbass USB has has serial numbers since USB 2.0 your poor man's software-raid-on-a-chip that came with your mobo might not check drive serials and rely on port but don't make shit up.
I ain't even mad.
I ain't even mad.
The parent does share a good thing that's not always immediately thought of.
Yes, USB devices do have serial numbers - absolutely. A lot of systems will however not care and just mount at random, if it's automounted. As an example, on Desktop machines - this is very common. You might use a Desktop for doing this.
It's a good idea to combine the parents parent post with the, sadly, only good nugget out of it.
Be careful to think over what happens when you restart/unplug the drives. Will the mount points change? If so, be sure to configure up the mounting of the drives with the USB ID of the device.
(USB ID is found with for example the `lsusb` program, you'll probably need to install an extra package to get it)