D-Link DAP-1820 Quick Install Manual page 9

Where should I place my Range Extender for best performance?
A Range Extender only works as well as the signal it is extending.
Therefore, proper placement of your Range Extender is important
in achieving desired results.
For best performance, place your Range Extender in between
your router and your dead zone, making sure it is placed in a
location where the Wi-Fi signal is still strong. Use the Smart Signal
Indicator to help find a location with a strong signal. The more
bars lit on the signal indicator, the stronger the Wi-Fi signal is.
DAP-1820 Install Guide
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