I read the previous posts but didn't see this exactly.
We have FTTH and I'm using an ancient router.
I need a VDSL+ to plug in the phone.
Current TP Link is terrible even at line of site. Single story, modem in middle of a small home.
Best VDSL and coverage for the $.
Call your ISP and ask for their unit. Maybe they will throw it in for free if you have been a customer for a while! Job done!