Show names for audio tracks and subtitles [in all apps]

What is the recommended naming scheme for subtitile files when one has multiple files of the same language. Seems it currently may not even matter given they will all just show up with the same language name in interface but would still like to know in case this ever gets fixed or there are some other implications I am not aware of. Seems like if one does not want them to show up as Unknown, the file name must at least end in a supported language code and subtitle extension. Some examples are below.

Avatar (2009).en.srt
Avatar (2009).1.en.srt

Avatar (2009).en.srt
Avatar (2009).2.en.srt

Avatar (2009).0.en.srt
Avatar (2009).1.en.srt

Avatar (2009).1.en.srt
Avatar (2009).2.en.srt

Read Plex ignores text in brackets in file names so perhaps the following is needed but if this is ever fixed I guess I don’t want it to ignore the text that differentiates them if they end up using that info.

Avatar (2009).en.srt
Avatar (2009).[1].en.srt

Avatar (2009).en.srt
Avatar (2009).[2].en.srt

Avatar (2009).[0].en.srt
Avatar (2009).[1].en.srt

Avatar (2009).[1].en.srt
Avatar (2009).[2].en.srt

Edit: Looks like Plex employee Moussa recommended the following format 5 years ago.

movie title (year).heb.srt
movie title (year).2.heb.srt
movie title (year).3.heb.srt