This is a very complex but important subject.
As others have pointed out, whether to absorb or transmit vibration depends on the floor, the equipment and personal preferences. After thirty years of experiments these are my findings:
On speakers. I have gone from spikes to Symposium Svelteshelves first flat on the floor, then on Final Daruma cups and balls to today end up with a cheap set of Chinese springs in cups
On electronic equipment I can’t even remember all the permutations: Sorbothane, then again Darumas, Symposium Svelteshelves, Black Diamond Rcing Cones and today Black Ravioli Big Pads on Gingko Audio platforms
On phono I have used a Townsend Seismic Sink for many years but now prefer spike mounting on a thick, wall mounted acrylic shelf (bearing the scratch marks with philosophic indifference).
In all this journey, two solution stand out: the springs under the speakers resulted in razor sharp soundstaging and lightning fast leading and trailing edges on individual instruments compared to all other solutions.
The Black Ravioli Big Foots are nothing short of sensational: the elimination of power supply as well as air borne vibrations resulted in significant ‘de-sludging’, i.e. an amazing increase of transparency on large orchestral works. It felt that the sound was much less ‘compact’ and closed in.
As always: Enjoy the Music