I use a SD card with /boot now to get around Dell’s UEFI on internal devices only thing (no Legacy boot from NVMe).
With discarded NVMe/SD, with Anaconda I select both drives, custom partitioning, standard, delete home, boot, and root (only thing left in list is BIOS boot), re-add boot (auto sets/fills SD), add root (auto sets/fills to NVMe), and done (I have boot and root as XFS currently):
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
mmcblk0 179:0 0 1.9G 0 disk
├─mmcblk0p1 179:1 0 1M 0 part
└─mmcblk0p2 179:2 0 1.9G 0 part /boot
zram0 252:0 0 8G 0 disk [SWAP]
nvme0n1 259:0 0 953.9G 0 disk
└─nvme0n1p1 259:1 0 953.9G 0 part /
I have a RTS525A and with most of my SD cards I got some voltage switch error in dmesg on-insert; not sure what it’s about but I kept switching cards until I found some that didn’t have the error, then chose a 2GB one. blkdiscard ideally should be instant for a quick test of speed.
I think using XFS on /boot has GRUB report something about writing outside the partition (don’t recall seeing it with ext4 on SD); I’ve seen it occasionally over a year on NVMe and different computers and assume it’s harmless 