1. google "access point"
2. use one router only, set everything else to be access points, wired back to that 1 router. read the manuals for how
3. consider hiring a geeky teenager to do it for you - they are cheap & they know everything
[ FYI I also have 3 devices, and various switches, but 2 out of 3 are setup as access point, so I only have one router.. CC works fine.. each access point has its own SSID so that I can see that I am connecting to.