I currently have the Actiontec modem/router. I would like to upgrade to the Quantum. Is there a way I can avoid having to individually reconnect my cameras, smart switches, etc?
If you change your wifi on the Quantum to exactly what the Actiontec wifi is then everything should just reconnect. Otherwise you will have to reconnect everything.
Same SSID, same password?
Yes. Same SSID/Password and the security has to be the same as well for example WPA2.