If you live in an apartment which has multistories then, or single-story apartment. Setting up an extender is necessary in both cases as it can repeat the signals on all the floors of the apartment. The existing router can soak the network signals and may be distracted because of the thick wood, heavy steel, and plaster pasted on the walls. However, this issue can be resolved just by moving the extender near the WiFi router. Most probably in the same room as the router. Or you can do one more thing for Linksys re6700 setup, you can place the devices in the above room but in the same place. It is the best and easiest way to elevate the signals even in a multi-story apartment.