At my store we do:
1 - General Channel (Sales floor, GSTL, Backup, Red Cards)
2 - Backroom Channel
3 - Private Channel (For specific info or conversations)
4 -Private Channel (When 3 is being used)
5 - ETL / LOD channel (LOD's, AP, and ETL's have access)
6 - AP Channel (LOD's, AP, and ETL's)...