Looking at this link page, the list that NOW supports from a playback perspective is pretty decent if you ask me.
Though i would like to see them add the NOW native App to Android TV (apart from Sony) and maybe Panasonic and Hisense Vidda smart TV's which i also own.
Further to what @schnapps said, most of the devices you have listed are supposed to work with Now.
So the problem you have isn’t that you haven’t got Now on those devices, it is that Now on those devices isn’t working for you.
But there is nothing in your posting that would help us to help you to get them working again for you ?