C&C Remastered is a really, really good release, it runs flawlessly through Proton, it doesn't install Origin in your prefix, and it has full mod support thanks to game code and a map editor that are both GPLed (please, someone port that map editor to linux. Yeah, it means putting $20 in EA's pocket, but honestly I'd say they deserve it for this. You might have the best luck with the game data in C&C Remastered, but I didn't really test that. I couldn't get an install off the disks because the installer kept complaining that I didn't have the disks inserted. well, the installers are temperamental at best.
And sure, EA put up those disks for free, you can just download them, but. okay, allegedly, but it would probably work better if I could get it to run: In order to make Vanilla Conquer play nice, you need to have an unmodified install of C&C Gold/Red Alert, as they would have come on-disk: The installs from the CnCNet installers won't cut it. option 2: Vanilla-Conquer is a project that uses the GPLed code from C&C Remastered to rebuild the original C&C executables with cross-platform support. However, if you're a diehard Linux exclusionist. There are Lutris installers that wrap them, and it's overall very easy (just make sure you add ddraw to your dll overrides in wine as native,builtin). These actually even come with Linux versions (don't get too excited: they're just wine wrappers) and are generally easy to work with. C&C: Tiberian Dawn/Red Alert: Here, you have options, since EA released the game for free.