After testing over 20 different APKs on a generic S905X box running Android 7.1.2, the most stable version is .
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(Nvidia Shield, Xiaomi Mi Box, Amazon Fire Stick, or a Google Chromecast with Google TV). apk netflix para tv box android 7.1.2
Go to Settings > Security & Restrictions > Unknown Sources. Enable this for your browser or file manager (e.g., X-plore or Downloader).