I am wondering why it is possible to link the same IP to different profiles? Which profile does NextDNS then use to respond to queries?
Each config had its own endpoints & dns servers. Linking an IP is only half the process, you still have to setup your device(s) to use the endpoints/servers of your desired config(s)
You can have different devices use different configs or just have all devices use the same config, just depends on the users' needs