I have the deco ac1200 and need to configure this with existing spectrum router and modem and directions are not clear the order. I have a central hub in the house with wired connections on switch which the hard wired connections are needed. I need the deco to extend the wifi range but cannot eliminate any existing infrastructure. is the order:

modem > ISP router > deco?

modem > deco > ISP router?

ISP Router > modem > Deco?

Any assistance would be greatly appreciated as I need to have the hard wired connections inplace and also need this deco to help withg house wifi