Plex uses IMDB & TMDB for movie information, not TVDB.
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They are movies. Place them in a movie library and use the default Plex Movie scanner & agent.
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Do not replace the colon, or any other illegal character, with a dash. Just leave it out.
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If a MP4 file has incorrect embedded metadata it can throw off Plex matching. Either correct the metadata or tell Plex to ignore it. Edit the Library → Advanced → deselect Prefer Local Metadata.
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Plex Dance each movie after renaming and reorganizing.
This matches immediately on my server:
/movies <-- folder added to movie library
/Louis Theroux The Most Hated Family in America (2007)
/Louis Theroux The Most Hated Family in America (2007).mkv