A:AnswerHi Tim, regarding your concern instead of an Orbi router, you may add an Orbi satellite instead. You may check this link https://kb.netgear.com/000062035/How-many-satellites-can-you-add-to-an-Orbi-WiFi-System
A:AnswerDoes the spectrum modem have Ethernet ports? If it does have ethernet ports, you should be able follow the Orbi setup procedure to use your Orbi with that modem.
A:Answerworks with any provider's modem to give you wireless internet that uses multiple access points without the annoying switching. It happens automatically.
A:AnswerThink of it as having many routers that all use the same network ID. As soon as you're out of range of one the other one switches you to the next one with better signal. So its like have a network of routers "hence Mesh"