A:AnswerAn ethernet cable is connected to your primary gateway Eero from your ISP modem and then any additional Eero’s can connect wirelessly to each other and/or connect to each other with an ethernet cable if desired as well.
In my example shown I have two connected over Cat6 and one over wireless along with an Echo 4th Gen over wireless too.
A:AnswerYou can just plug the ethernet cable directly from your current modem router combo to this eero and set it up.
Make sure you will still able to connect your current modem router combo. You need to remove that SSID from all the devices you have and add new eeto wifi so all traffic will go through eero to modem/router combo.
