RAID configuration for backup repository

I am looking for more information about which RAID and how best to configure it. I have a new setup consisting a  R730xd server, 4 MD1420 disk shelves with 24x1.6TB 10K disk drives in each shelf, a H830 PERC controller.

The intent is to create the largest single volume to be used as a Veeam repository for backup data, therefore, RAID-10 is not a good option.  Fault tolerance is key, so do not want to use RAID-5. So, I was looking at RAID-6 and RAID-60.  The calculators I looked at said I could expect about 144TB with R-6 and 140TB with R-60.

I am new to setting up a RAID volume and using the PERC card so I have been seeking out advice. Not finding too much helpful information online about the PERC steps and whether R-6 or R60 is better.But it was explained to me the only way to do get a R-6 volume that large would be to create 4 virtual disks and then use Windows to combine them into a single volume, but that is not a good option because it would be combining software RAID over hardware RAID and is not a Dell best practice. I was then told that it was possible to create a single R-60 virtual disk that could be mounted as a single Windows volume but that it was not the best choice because it the virtual disks would be spanning the shelves and that isn't a good thing to do.

I know there are large RAID volumes out there. How is it done?