A:Answerthe other 2 units are basically extenders from the main router. but they can all work off each other. you only need 1 router to feed the house with internet. their signals work well, but they need to be positioned in the right place. plan it out ahead of time and try to get them not to far from each other.
A:AnswerI have Spectrum and purchased my 3 pack several weeks ago. The setup is not difficult, but you do need to follow directions to the t. Coverage immediately is better, however I've found I need one more on the other side (east) side of my home for my outside camera. Overall a very positive experience.
A:AnswerEssentially with atat you cannot bridge connection. What you can do though is setup an IP passthrough to your eeros and shut off(turn off) the wireless signals coming from the modem/router.
A:AnswerIt will work though the WiFi connections are terrible on the eero. If you have a dual modem/router combo sometimes they do not pair with a external router you may want to research the current device.
A:AnswerYes, you can add more. eero says that you can have unlimited devices, but they don't recommend going beyond 6. After 6 they say you may notice a decrease in the quality of the signal.