I'm using the cheapest Synology NAS (DS119j) paired with an SSD. It runs between 10-5 watts. However it might be a bit limited in terms of computing power to

I'm using the cheapest Synology NAS (DS119j) paired with an SSD. It runs between 10-5 watts. However it might be a bit limited in terms of computing power to run Kodi and all the other uses you want in parallel. It has a fan but I have never heard it make any noise. So depending on your needs it could be an easy "setup and forget" kind of box.