I am doing some research in whole home wifi and since I am leaning towards the Deco system, I am wonder why do they not come with more then two ports? We have Voice Over Ip phone which means we have a

looking to pick up a mesh router and am going towards TP-link but am getting confused with all the different Deco's (M9, P7, M5, M4,E4) what is going on here, whats the newest and whats the difference