Having 2 routers

1

i wanna get a new router and keep my old router i don’t want to turn it into an access point because the old router is upstairs and i want the new router downstairs in my room and the only way i can really get an ethernet cable down there is through the vents and my vents are crazy complicated and i got sent here to sort out how i can have both of them at the same time and not have them mess each other up am i in the right spot?