A:Answer Actually, you can use one pack, two packs or three packs. It all depends on the size of the home and how much area you need Wifi. I would begin with a two pack. Any of the units can be used as the router, which would be the one you connect to your gateway. The other unit(s) will serve as extensions to that pack. You can buy a two pack system now and if needed, you can extend it by obtaining an additional pack. Decide now which Wifi network you wish to install. Linksys has their network wifi mesh systems in either Wifi 5 or the newer Wifi 6 standard. Hope this helps.