Android TV is included in some modern Smart TVs, and there are also external set-top-boxes to get Android TV for any TV with HDMI input.

However, there are also some set-top-boxes which almost, but not quite, support Android TV.

With not so much extra effort, it is possible to make an Android app supporting those fake Android TV devices as well as the real ones.

In addition to the guidelines from Google for building Android TV apps, do this to support the fake TV Android TV devices as well: