Yes, if you'd prefer to continue using a wireless router you already own you may connect via Ethernet connection to your Internet modem. We recommend putting the Internet modem into Bridge Mode to turn off the broadcast of its WiFi signal and ensure the best possible WiFi performance.
Your installer can assist you with putting the device into Bridge Mode during installation. If you need to change this setting after installation, see our How do I change my Home WiFi settings, including network name (SSID) and SSID password? FAQ to access the the device's WiFi Settings, where you can enable Bridge Mode. Please see the device's user guide for additional instructions.