I’m hoping that’s just because I installed them on the same disk though.
No. It does not matter where they are installed.
Usually Grub successfully finds all distros installed. I guess that it fails because of some Atomic distro differences. If you use Grub from Fedora Atomic, it should also find a “normal” distro.



I didn’t try many of them. I use Ansible for my job, but sometimes I hate it. I would try Terraform/OpenTofu or Salt if I were looking for alternative.