Will this work with the Asus RT-AC66U?

Yes, the ASUS RP-AX58 AX3000 Dual-band WiFi 6 Range Extender supports ASUS AiMesh, which allows it to create a flexible, seamless whole-home mesh network with AiMesh-compatible routers. Since the ASUS RT-AC66U is AiMesh-compatible, the RP-AX58 should work with it.

Questions & Answers: ASUS RP-AX58 AX3000 Dual-band WiFi 6 (802.11ax) Range Extender/ AiMesh Extender RP-AX58

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ASUS RP-AX58 AX3000 Dual-band WiFi 6 (802.11ax) Range Extender/ AiMesh Extender RP-AX58

High Efficiency WiFi 6 - Enjoy fast speeds up to 3000 Mbps with WiFi 6 (802.11ax)
Commercial-grade Network Security – Lifetime free ASUS AiProtection Pro, powered by Trend Micro, with WPA3 to protect your home
More Privacy, Anywhere - Instant Guard gives you one-click secure internet access via RT-AX68U from anywhere in the world
Parental Controls for All Ages - Customize settings for different age groups, giving your kids the internet access they need
ASUS AiMesh Support – Create a flexible, seamless whole-home mesh network with AiMesh-compatible routers

$79^.99 –