While snaps are the more common way for people to install LXD, there are RPMs for LXD. I maintain the openSUSE ones and I believe there are ones for the RHEL/CentOS/Fedora family as well. Obviously, once incus is ready for packaging, I'll start packaging it for openSUSE as well.
At least on Fedora I've always found the RPMs either lagged pretty far behind version wise (at least the COPR repos, I can't remember if I tried the OpenSUSE ones or not? But I generally try not to use OpenSUSE RPMs due to differences that crop up between SUSE and RHEL families packages), and the snap version basically didn't work for all but the most basic cases.
I'd love an actually up to date RPM compatible with the RHEL family.
