WiFi can drown out Zigbee channels (they operate in the same band) so the stronger your Wi-Fi, generally the worse your zigbee sensors will perform. Of course if you are using Wi-Fi sensors or even Z wave sensors, that won’t be an issue. But it’s just something to be aware of when you’re planning your network.
I agree with the others who suggested moving The router and hub up out of the basement anyway. Even if you put it in a closet. You want your network controllers located centrally in the house, both vertically and horizontally. not only are basements on the edge, they typically have cement, metal, and water pipes, all of which interfere with signal.
You can search the forums for more discussion on minimizing WiFi/zigbee interference.