16:9 aspect ratio resolutions: 1024×576, 1152×648, 1280×720, 1366×768, 1600×900, 1920×1080, 2560×1440 and 3840×2160.
16:9 is the most common ratio TV screens support and if you upload your content in one of the above resolutions then it'll fit perfectly on your screen with a single zone layout. However, do not worry the content is not in an exact resolution, you can switch "Switch image to fill screen" in the playlist option to ON. This will stretch the image to full screen without black space around it.
Please refer to this article if you want the dimension for the other zones.