You can QoS tag by whitelisted mac addresses if it's just priority to known devices generally. At best your router may be able to slightly shape devices on the

You can QoS tag by whitelisted mac addresses if it's just priority to known devices generally. At best your router may be able to slightly shape devices on the network (strategically dropped packets). QoS over the air doesn't really work as there's zero control of any devices tying up RF spectrum, and zero ability to defend against DoS attacks (E.G. neighbor trying to stream 4K over wifi).