I'm having great results after mounting adhesive-backed Herbie's dots under the hardwood platforms that support my amps, Thor phono stage and Super Scoutmaster Ref. The VPI platform is a 28" x 20" X 4" maple beauty I got from Dawn's that weighs about 65#. The preamp's platform is a 17" x 4" that looks like a million bucks under the round Thor. All my gear is ultimately supported on a Steve Blinn Super-Wide with three 5' maple shelves each supported by .75" Herbie's dots glued to the support-ears that normally get a small rubber ball inserted into a small hole. The rack's cones are then supported on Herbie's giant Titanium gliders. The gliders ere the most expensive thing I changed @ around $160/4 abd all the dots combined were about $60 more.
Unfortunately for Science, I installed all the Herbie's stuff at the same time and so cannot attest to which ones did the most good, but the improvement in sound stage clarity and bass quality were stunning.