I am completely in the dark about how all this works. I have tried my best to google and learn but it goes in one ear and out the other. Would love someone to dumb it down for me and help me with my issue.
Just moved into a flat in Germany and the cabinet is too small for my router (Speedport Smart 4)(It looks like there is space in the picture but the router doesn’t fit)https://imgur.com/a/f0PTM9c. In each room there is an ethernet plug in the wall that has a connection inside this cabinet and the reason why I want to have the router in there. I am using DSL plug (is this correct? Its what the telekom technician informed me to do). I would love to find a way to have the router not be inside the cabinet or to have the router dangling from cables outside the cabinet as it currently is.

Thanks for any help :D