If you are going to use the gen3 without an aftermarket power supply or other kit, you’ll need to retain the Starlink router and connect it either via Ethernet or WiFi as WAN. If you don’t want the WiFi network to be broadcast from the Starlink router, and want your Peplink to do that instead (which is the usual choice), you can put the Starlink router in bypass mode which I believe I cover in the article that is connected to this forum post.