T-Mobile Home Internet + Google Nest WiFi

I have a TP-Link Deco M9 Plus mesh router system that used to be connected to a cable modem for internet service. After setting up the T-Moble home internet device and making sure that it was working properly, I just unplugged my Deco from the cable modem and plugged it into one of the two LAN ports and after rebooting the Deco, everything worked fine. All the 30+ devices already signed into the Deco Wi-Fi continue to work normally. I have my gaming laptop signed into the T-Moble Wi-Fi directly to minimize lag. Doing a speed test on my laptop, I was very pleased to get a download speed of up to 200!