Track Audio make some good quality spike shoes (Kudos Audio make use of their spikes for their speakers so a good match too for Kudos ). I found that the solid inset spike shoes work best on my wooden floor above a concrete base and sound better, to my ears, than Naim chips.
I believe that you need to decide whether you want to couple or de-couple your speakers from the floor i.e. allow your speakers to transmit vibrations into the floor (and vice versa) or isolate vibrations from the floor. Isoacoustic Gaia’s didn’t work with my current speakers (Kudos T88s) on my flooring as they decouple the speakers from the floor which seemed to prevent the speakers from dissipating vibrations and worsened the sound quality. Hence there is a degree of ‘speaker influence’ as well as ‘floor influence’…as usual you probably need to try a couple of different options in your space.
I did this once. Never again. I put a 30Kg speaker on the coins and when I moved 2 years later, the ridge around the edge of a 2p left a round impression on the floor.
I too found coins stuck to and marked the floor. Looked a bit downmarket too. I found chips better in appearance and sound, but QX7s, though a good deal pricier, were better still.
Wood floors and Naim have a great ‘live’ sound imo. Our floor is 3/4 inch oak over a 1/2" subfloor over joists, so it’s very solid - and solid sounding. I use generic spike cones picked up off the 'bay (about $12 for eight if I recall) and Herbie’s dbNeutralizer material stuck to the bottom of those. The Herbie’s definitely tightened up the sound, and keeps the speakers well in place but easily moved if needed to.
Didn’t have a problem with them myself, but each to their own I suppose. You can put a thin felt ‘pad’ under it or experiment with thin rubber if the edge is a worry, or just sand it off!
Too add to the excellent options already stated, I use a set of PTS-G from TAOC under my equipment rack. Each spike plate is made of gradation cast iron (130g) with felt underneath that provides a very innate base.
