Apple TV's capabilities as a digital signage tool are evolving, offering a practical, affordable alternative to traditional signage systems with seamless setup and robust performance.
They do perfectly well, as the newer models use an A15 bionic processor which is the same chip as the iPhone 13. My Apple TV stays on 24/7, with a screensaver in the background, and heat is never an issue. And they were designed to be kept in media cabinets which are enclosed spaces without much ventilation.