Never could understand the rack thing. Why on earth would you wanna put your components within each others magnetic field is self defeating. They look pretty, cost a lot. The biggest selling feature appears to be little space required.
For me its target speaker stands with a wood box screwed to stand filled with sand and a maple plinth resting on the sand. All components are at least three feet away from each other. No hums,buzz or the like. The results of this for me has been more info coming through the system. If you have the room try separating your components and give a listen. Affective IMO.
rollo