It seems that Kodi[1] would be your perfect choice, and that is indeed what I'm using in a very similar setup.
Setup your media (local or remote) library, and the scraper will enrich it with posters, synopsis, actors, etc.
[1] https://kodi.tv/
Setup your media (local or remote) library, and the scraper will enrich it with posters, synopsis, actors, etc.
[1] https://kodi.tv/
I've had success with Kodi in the past with my laptop but I've also had big performance issues on the firestick. To be fair, it's been a couple years since I tried that so I'll see if the newer versions perform better.