you wont need it if you are planning of using it only in your house i suggest install the belkin modem router somewhere in the middle of your house where the signal will be distributed evenly keep in mind that signal will go through walls but the strength of connection will vary depending on the distance and the barriers

and if in the future you decide to get your own adsl connection just plug in the belkin directly and it will act as a modem for you no need for the modem/wireless that q-tel uses keep it or sell it