Mine looks like this:

UUID=blah /media/games ntfs3 uid=1000,gid=1000,umask=000,rw,user,exec,nofail,nocase,windows_names 0 0

If you're copy-pasting this, make sure your uid and gid matches of course.

But the key thing for Steam is you need to have your compatdata folder on a Linux partition, because Proton creates folders with invalid characters (like :). windows_names would prevent that of course, and thus prevents corruption, but it would cause Proton to fail since if can't create those folders/files. So you'll need to symlink that folder on your NTFS disk to point to a folder on a Linux partition.

Eg:

$ mkdir -p ~/.steam/steam/steamapps/compatdata
$ ln -s ~/.steam/steam/steamapps/compatdata /media/games/Steam/steamapps/ 

Of course, before you run the above, you'll need to delete the existing compatdata folder from the NTFS disk.