Hello Community!  I recently purchased the Archer BE550 for a better wifi solution that what I have with my current Wifi provider (Frontier - only option available).  I have an existing modem that also serves as a router, Arris NVG443B.  In reading installation documents, sounds like I have to keep the original modem/router and connect Archer to it.  I could really use the help of this group with the following 

• Given that I'm keeping the original modem/router, is there even value in setting up the Archer?
• Is there anything I have to do to maximize the value of this setup?  I read various articles about needing to disable the original router (and keeping it as a modem), setting up a bridge on the old router, or setting up archer as an access point.  Can someone clarify what to do to maxime the value of this?

Thanks very much in advance!