The HRS stuff is not just marketing. You can hear for yourself by adding it to any massive wood rack. See Nimbus couplers. You will also want to consider the damping plates. Vandersteen does recommend Granite BUT with a constrained layer IF at all possible.
Skyscraper what a wonderful question....I am going down that very exploratory path on an amp stand right now. I have sourced a variety of cones, etc a near 3” slab of very old aged Walnut in an irregular shape ( sometimes that rectangle is not your friend ) and will spend several grand figuring out which isolation feet sound best... I will source HRS for that project as well...fun
Skyscraper what a wonderful question....I am going down that very exploratory path on an amp stand right now. I have sourced a variety of cones, etc a near 3” slab of very old aged Walnut in an irregular shape ( sometimes that rectangle is not your friend ) and will spend several grand figuring out which isolation feet sound best... I will source HRS for that project as well...fun