I use a 2-slot USB HDD enclosure hooked up to an RPI-3 to feed the two RPIs running Kodi on my TVs via Samba/NFS. Works like a charm. I also use Deluged on it to download torrents directly to the HDDs. Public domain media only, of course.
[note: I fried the video chip on an RPI-3 when I incorrectly fitted a fan and shorted something. It still works fine as a headless box though, which is why its my little black box o'bits]
Might use this to get one of the previous 3s which will inevitably end up on ebay to upgrade the RPi-2 Kodi box upstairs.