component cones/spikes vs. rubber

I'm trying to decide whether I should put cones/spikes or Vibrapads/pods underneath my woodshelving which is directly underneath my components?

(Note: I currently have wood shelves underneath my components so the spikes/pads will be placed in a platform config. All of the above will be sitting on an audio rack)

Components:
1. Cary CD player
2. Audible Illusions 3A pre-amp
3. BAT 75SE tube amp

Appreciate any comments/thoughts?

Thanks,