Don’t even plug in your shitty ISP router, they always suck. Always use your own router directly, don’t just put theirs in bridge mode.

put it inside a cage and connect your own wifi router from outside to the LAN ports.

In Italy routers provided by Fastweb nowadays come with integrated Alexa…

Airtel provides great service, but they are terrible at such things. They won’t let me disable the WiFi, even though I am in bridge mode and am using my own router. In their UI the options are greyed out. Their “engineers” don’t know anything other than wiring stuff. Half of them say they allow port forwarding, while other half says they don’t allow it for security reasons.

If it is possible for you, get a business connection, rather than a residential one.