Knock Knock streaming: where to watch online?
Currently you are able to watch "Knock Knock" streaming on Youtube TV, MovieSphere+ Amazon Channel. It is also possible to buy "Knock Knock" on Amazon Video, Apple TV, Fandango At Home, Microsoft Store as download or rent it on Amazon Video, Apple TV, Fandango At Home, Microsoft Store, Spectrum On Demand online.
You can also stream the title for free on Plex, Plex Player, Plex Channel.