BTFS - Raid1 for System Disk

Hi everyone, I'm experimenting with Fedora 33 & BTRFS on VM for a setup I'd like to do in my desktop in the near future. I'd like to have my system drive with BTRFS on a RAID1 profile. I was experminenting with a simple / (root filesystem) subvolume but it appears GRUB2 can't work properly with it. I get the famous: "Sparse file is not allowed" during boot (and no way to access GRUB2 menu). It boots fine but I can't longer edit the GRUB2 menu during boot. Fine, I read somewhere that /boot wasn't allowed with BTRFS in Fedora? ok, I then tried to create a separate ext4 /boot partition (using Anaconda) but it created a mess (partition-wise) so I'm going to install it again with just one disk as /dev/vda1 for /boot and vda2 for BTRFS , then afterwards I'll copy partition tables to /dev/vdb, rsync /boot and balance to RAID1. I'd like my desktop to have a RAID1 setup for my main drive and be able to remove either disk and boot seamlessly. Is this possible with BTFS & GRUB2 these days? I tried to followed link [1] but it doesn't work with Fedora33. Does anyone know of any online guide to accomplish this with F33? Also , is it really necessary to have a separate /boot partition? Aren't there any workarounds? I'd like to keep stuff simple and have only BTRFS / & /home subvolumes. Thanks! -- Jorge