Plex isn't really designed to run on your daily driver (though it will). It is built around being run on something that's no longer in daily use which quite a home computer users few have.Haven't used it, because I really don't like to setup my pc to stream (prefer not to bog it down), but the Tivo Bolt does have a Plex app.
Plex won't replace a streamer and that's where TiVo has an advantage with its modest streaming app library.