What is the best location to place the Tenda A9 after initial setup?

After extending, relocate the extender to another electrical outlet and observe the LED indicator to find the optimum location for best WiFi performance. A signal strength of 40%–79% is considered the optimum extending location, indicated by a solid green LED. Keep moving the extender to outlets closer to the router if the LED shows solid orange (poor signal).

From the official Tenda A9 Wireless N300 Universal Range Extender manual, page 1

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