mi box 3 (mdz 16 ab) or mi box S

I'd look into Jetstream 4k.

Uncertified devices running the Android TV OS = no Chromecasting support, no 4K Netflix:

Mecool M8S Pro L

Mecool KM9

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Google Certified - cheap Android TV devices:

Xiaomi Mi Box S (2018)

Xiaomi Mi Box (2016)

Ematic Jetstream 4K Ultra HD

Mecool KM8 (avoid due to really buggy Firmware)

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https://support.google.com/googleplay/answer/1727131?hl=en

MiBox S or Mecool KM9 or Vodafone TV (Australia Edition)