To enable the CEC (Consumer Electronics Control) feature on Apple TV, you need to connect both TVs to the Apple TV via HDMI and ensure that the CEC feature is enabled on both TVs. When you use the Apple TV remote to control, CEC can help you turn on/off both TVs at the same time. However, this may depend on the compatibility of the TV and the specific Apple TV you choose. If unsuccessful, it may be necessary to consider other solutions such as using a different control system.