You can do it either way. Your preference will determine which method is best.
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They are most definitely an effective isolation device, although they are not the only isolation device I use.
As for amp use, I currently have my amp stand spiked directly into four Aurios, also have my amp sitting on 2 Aurios on top of stand. Spiking the stand into the Aurios was a definite benefit vs. Aurios only under amp and amp stand spiked into floor.
Mrtennis, I agree there is a reduction in noise and increase in focus with the Aurios and other metal ball bearing isolation devices such as Cerupucs, Cerabases,Final Labs Durumas, I also hear an increase in air/spaciousness around images with all the metal isolation devices. I've found that isolation feet made of other materials, such as sorbothane, rubber, Herbies, BDR cones damp that air/spaciousness to some effect. All have their place in my system, its just a matter of tuning to your liking.
I liked the first Aurios which absolutely needed to be on a level shelf. When you did them right, they were very good. Then the company went to a deeper concavity to allow less level shelves. These were no where near as good. Isolation is a very inexact effort. I had a good deal of success with Aurios and poor experiences with soft materials, but now my speakers are on Townshend speaker cradles which are pneumatic. Most of my electronics are on Halcyonics active isolation bases. But both are expensive although quite effective isolation devices.