I have Xfinity modem/router.   I was using extender with good results. However, I was manually having to change my phone WiFi connector based on where I was within my home. In an effort to get around this, I bought the Pro. 6 series. I connected one via cable to the Xfinity modem and set up another upstairs.  I did not put into bridge mode.  I have gigabyte speed with my Xfinity router but getting only 150-200 through the Eero mesh network.  I could be doing this wrong but need guidance here.