I’ve had a good experience with HeliBoard

NZB360

This is Nintendo’s point, making use of the prod keys goes against the DMCA

It has a few clients available for different devices, I’m using the Android TV client for example in my Philips Smart TV

Yes, but you need to know a little about network configuration to do that

All of you folks using Plex should check out Jellyfin, it may suit your needs better.