I guess I should rephrase.
I already have a (couple) AppleTV and will be looking for a new TV soon. My current TV doesn’t support volume control over HDMI-CEC from the AppleTV. I’m looking for a TV that will allow me to control the AppleTV and the TV power and volume all from the virtual Apple TV remote on iPhone.
My work has TVs that have this functionality but I haven’t been able to find a TV that works with power and volume, all of them have only been power control.
Can you describe how to do that?