If you purchase something that doesn't explicitly say Netflix certified, chances are Netflix may not work in full quality or it may stop working. Similar story with Prime and Chromecast.
If I were you, I'd get best quality projector I want and connect a firestick to it.
At 20k, you are just not going to get a practical projector that you can use even in dim lighting conditions or with proper keystone support. Try to get a LED projector with the maximum ANSI lumens which will definitely cost a lot more and will still be unusable with any form of ambient light. Also, none of the Chinese projectors will have Widevine L1, let alone Netflix certification.