How should I install apps that do not have verified flatpak version on fedora atomic distro?

Check out GitHub - boredsquirrel/MullvadVPN-Tricks: Making MullvadVPN work better on GNU/Linux

Is it the same way (rpm-ostree) for all VPN : ProtonVPN and so on… ?

afaik as long as they have a repo, though I agree with JG I wouldn’t recommend proton for linux if you want to use the GUI

Why ?

(their GUI is minimal, but good enough…)

Because VPN kill switches on Linux are finicky and may not always work. Which is why I made this wiki post:

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See ProtonVPN Additional note: Killswitch failure and IP Leakage on Linux

Also Proton just generally doesn’t give as much attention to linux

You can also layer your VPN

You mean use two VPNs at the same time?

I mean layer it as a package. I responded to this