I'm actually surprised you're able to support true multiview across diverse hardware platforms at all - so congrats! Consumer streaming sticks, dongles, boxes and smart TVs are a fragmented hellscape between divergent hardware, firmware, OSes, codecs, DRM and apps. Pretty much anything more demanding than baseline '1 stream in 1 app' will have lurking issues on at least one platform with a >1M unit installed base.
The android streaming device market pretty much died when it became a race to zero margin. Arguably, the best Android-based streaming device money can buy is still the NVidia Shield, which is a 10 year old hardware design.