I'm sorry if I seem argumentative. What I'm trying to point out, as is Nimiq1, is that there is a prescribed way of doing things so you don't end up with screwups. Although there are homeowners and cable and satellite installers who could do a fine job of this using existing cabling, the fact that some installers (and some homeowners providing incorrect information) are not very good, leads to screw-ups that can be avoided with the correct procedures.
I recently saw a programme of an explosion at a Texas BP oil refinery where no one operator was to blame, but had the appropriate procedures been in place, the explosion would not have happened and 15 people would be alive today.
No one is going to die from an improperly installed satellite connection (I hope), however, improper (non-prescribed?) installations can lead to problems with diagnoses (today and in the future) by the various service providers and by existing (and future) homeowners.
Installs in older homes with cables run on the outside of houses may be that way, however, I would think that in all new construction all of the splitters would be at the panel with all cables running properly inside the home with only one wire running into the home.
This assumption may not be true for this case and is unlikely to be true for any new construction, as I mentioned above. The OP could advise if there's more than one wire coming in from the outside cable box.