Can I just use one or do i need to use two? Meaning do they work individually or they need to be connected in mesh for them to work

Yes they can work individually. You will be getting 2 of the same routers. You can mesh them or use them independently. Mesh is very nice as long as you don't place them too far apart

Do i need a modem with this?

Yes. Your modem connects to this

Questions & Answers: Asus AC1900 Dual Band Gigabit WiFi Router with MU-Mimo

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Asus AC1900 Dual Band Gigabit WiFi Router with MU-Mimo, Aimesh for Mesh WIFI System, Aiprotection Network Security Powered by Trend Micro, Adaptive Qos and Parental Control (RT-AC1900P)

Dual band with the latest 802; 11 AC 3x3 technology for combined speeds of up to 1900 Mbps
1.4 GHz dual core CPU enables smart multitasking by dedicating separate lanes for Wi Fi and USB data; Network standard: IEEE 802; 11a, IEEE 802; 11B, IEEE 802; 11G, IEEE 802; 11N, IEEE 802; 11AC, IPv4, IPv6
Effortless router setup with the ASUSWRT web based interface; Dual band connectivity for compatibility and performance
Monitor and manage your network with ease from your mobile device using the intuitive ASUS router app
A protection powered by Trend Micro provides multi stage protection from vulnerability detection to protecting sensitive data; Please refer the installation manual and the user manual before use which is highly essential; Dc output: 19 Volt with maximum 1; 75 a current; Guest network: 2; 4 Gigahertz x 3, 5 Gigahertz x 3

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