The question is what you mean by "strong". The device has enough power for fast internet lines. And if the WLAN coverage is not enough, you can meshen. To do this, you buy more routers of the same type. Advantage: The device has 3 WLAN modules. One of them is used only for the mesh network. This does not reduce the performance for the clients that connect to the WLAN.

Counter question: How big is your house?

And another tip regarding UPC: To get the WAN IP directly on the interface of the router, you have to bridge the UPC router. But that only works if you call the hotline and switch from IPv6 to IPv4 ... (at least that was the case until recently. Information changes quickly) ;-)