Hello stefanito,
If you buy a water container with a capacity of 10 litres and pour 15 litres of water into it from 5 different taps, you can only take 10 litres out of the container. But you don't know which 10 :-) // Just try it. If the worst comes to the worst, you can revert to the factory settings. Here are the complete operating instructions:
https://www.technisat.com/assetsFS...
This type of device works for me, via a multiswitch, on 3 satellites with around 800 TV and 150 radio stations, and I can never watch or listen to them all together.