Is it a cable router/modem or Fios? Or, god-for-bid, good old copper DSL ...

Being a newly constructed home, it should at least have outlets/ports in all the living & sleeping space with coaxial (RG59 or 61) and telephone (RJ11/45 ) or Ethernet (Cat5, unlikely to run Cat6 for obvious $$). Pop one open & look behind the wall panels - to see what the builder used??

It might pay to just get an electrician good with telecomm hookups to run some Cat5 or 6's between the floors (it's often not difficult to drill from inside the closets and neatly hide them, without running it down near the floor (then, you can have a modem on each level ...)

Even while running Fios at quantium speed, we still prefer hard-wiring except for the real mobile devices - our fiber gears are in the basement with coaxial bridged router/modem running on floor #1 and #2.