As mentioned in documentations at here:
Screen elements that must be visible to the user at all times should be positioned within the overscan safe area. Adding a 5% margin of 48dp on the left and right edges and 27dp on the top and bottom edges to a layout ensures that screen elements in that layout will be within the overscan safe area.
Thought, this doesn't seem proper solution for variety of devices as overscan margin differs for different vendors significantly.
In stead of setting fix margin, is there any way we can get/calculate the overscan area for Android TV devices?