Popped the back plate off my 2 channel mixer (6 screws), attached the K&M yoke to the back plate with the bolts provided, re'fitted the back plate to my mixer.
The other part of the K&M with the swivel, is attached to my lower speaker stand centre pole with a "U bolt clamp" AKA, Satellite antenna clamp.
This "for me" is the perfect set up.
There is many other ways of using these. I am solo and in small venues, so I must squeeze into small spaces. This K&M swivel is the answer.
Lucky I have Thomann online to browse through hundreds of variations on this K&M fitting and it even looks "the business" when assembled.