It depends upon what you want to achieve. I don't think you can have both connected to the incoming broadband telephone line and expect them to work independently. However if you want to extend broadband coverage that's a different matter. I had a set up consisting of my ADSL WiFi Router serving the top of the property and then a LAN cable running down one floor where I had a second router acting as an Access Point and radiating WiFi to parts of the property the main WiFi router can't reach. You need to fiddle with the secondary router on DHCP etc to make it work. Eventually I changed to using HomePlug and transferring over mains 240v wiring with a Network Switch at the secondary user point to accommodate multi users.