pfra We recommend the Connect Pods or another mesh system so that you have uninterrupted WIFI in all floors. You can also purchase and install WIFI repeaters from specialist retailers. Please note that if you switch from one WIFI repeater to another, there will be an interruption, which is not the case with mesh systems.
I would keep the modem as you have more settings with your modem than the Connect Box 3 Fibre.
Greetings
Daniele