Technically you could mod these games on Linux but it was a bit wonky. So I preferred to play these on Windows with MO2.
Then I started using Steam Tinker Launch to setup and run MO2 on Linux and thus stopped using Windows.
However STL does not seem to be getting updates these days so I now use this for modding Skyrim, Fallout, etc: https://github.com/rockerbacon/modorganizer2-linux-installer
Edit: Nexus mods are also working on a cross-platform app for modding, though its still in alpha. Currently only a few games are supported with support for more coming soon.
Keep an eye on the NVK project.