I have 3 smart TVs, 1 laptop, 2 EBox T8V version 5 streaming boxes and 2 iPhones. I want to use my new ASUS RT-AC87U router when I have Spectrum install WiFi service. Should I use the modem provided by Spectrum ISP? Do I even need a modem with the ASUS RT-AC87U? Should I purchase a more capable modem to compliment my high speed router?