Question about Apple TV 4K (3rd Gen) + Ethernet

Yes, you can access ZDF on the Apple TV 4K (3rd Gen) + Ethernet (128 GB, tvOS 16), as the ZDFmediathek is integrated in the TV app. The availability of ProSieben and SRF in the TV app has not been confirmed. However, you may be able to access these channels via dedicated apps or other streaming services if they are available on tvOS 16.