Multifeed Unicable System

Hello everyone, I ask for your support for help, after having hit our heads a lot... simply because I am not a satellite technician and I lack basic knowledge. But this does not mean that I do not give up: unicable technology is very similar to vlans in networks (so using the division of frequencies it is possible to transmit on a single cable "multiple signals") and is a genius. But I miss a fundamental part: what that device in the picture that I would need to get the desired result? I kindly ask you to propose suggestions also in consideration of scalability and possible use with sky q systems. Thanks in advance... You would help me with a big headache.