Drum Kit = 1 Kontakt instance
Each Drum sound = 1 Kontakt instrument in that instance
So if you have a drum kit with 20 drum and percussions instruments, that’s just a Kontakt multi with 20 instruments. Now that instrument channels may have multiple outputs, you can direct each instrument to single mixer outputs. I for myself prefer drum mixing within Kontakt and use just one stereo out.
But all happens on ONE instrument track!