I prefer to put '/BOOT' partition on mirrored LVM volume. Anaconda seems not to allowed it despite GRUB2 has LVM module to read Kernel and Initramfs from LVM volume.
Tel me please, what is the best way to put configuration record such as "set root=/dev/vol_group/boot_volumes" standard "/boot/efi/EFI/redhat/grub.cfg" menuentry ? Grub2-mkconfig seems to erase alien records during upgrades cycles.