I've installed it through secureblue's ujust script. I think this has been the smoothest experience I've had with it on Fedora Atomic.

Previously, I relied on the wireguard profiles I downloaded from ProtonVPN and which I loaded through NetworkManager. While it definitely worked, it was a hassle to redo it every now and then. Furthermore, switching on the go to something else I hadn't loaded already was never an experience I enjoyed doing.

Though, for completeness' sake, ProtonVPN^[Note that, IIRC, IVPN and Mullvad don't fare better in this regard.] hasn't fixed its IP leakage on Linux. And, to my knowledge, the workaround is only available with access to the wireguard profiles. And thus, the cumbersome method actually offers a very tangible merit over the comfortable one.

Finally, while I don't endorse the use of NordVPN, it's the only other VPN that's installable as a sysext. Note that systemd system extensions are still experimental, though. Even if they've (read: N=1) been reliable to use for me.