Hello..
If you want to connect 2 devices, you also need 2 cables, unless you want to reconnect each time. With this cable you are on the safe side for the future. However, it is probably a bit too much for the Swisscom Box and a reciever.
You could also choose a cheaper variant. For example, this one:
Basic HDR (1m, Entry)
It supports up to 4K resolution and is therefore sufficient.
Greetings