"@davejaz - I don’t know if this is what you meant in your last post, but I would not use the Symposium together with Vibrapods, as Symposium works with rigid coupling between the component and the shelf. One or the other. "
I've used Cardas wood blocks with Symposium shelves to good effect. They are a solid connection, but are wood. Some footers slide more easily than others, which can be a problem.
One thing that is overlooked is the resonance of circuit boards and parts inside. I usually open the component and carefully apply damping and resonant control. This is in addition to the footers. Just on the lid helps with resonance control.