Make yourself a solid platform of 8x8 or 10x10 timbers. My Accuphase A-48S Class A amplifier sits on a bench made of solid 250 yr old Chestnut timbers supported by steel legs and it's dead quiet and stable. You'll have to see my system in my profile.
My Accuphase DC-1000 and C2300 are stacked together and sit on piano coasters. The ones I have are gold metal caps on industrial grade rubber with additional steel plates internally for added strength and rigidity. The bottom have felt pads for sliding capabilities. The gold matches my Accuphase components nicely.
The metal portion are concaved to accommodate the wheels on a piano leg but my Accuphase factory footers are nicely seated so that just the perimeter of the footer has contact with the shallow metal cap. They are used to prevent the sounds emitted from the piano from transferring into the floor on addition to protecting the floor and they work! Amazon $80 for a set of 4. They also come in solid wood, solid rubber, solid acrylic.. I'm sure the solid wood would be something I'd consider but I'm very happy with the metal-rubber hybrid ones I have. If they are good for a Steinway piano I'm assuming they should be great for components.
Amazon: Brand: Ecliptica 4 Pcs Metal Upright Piano Caster Cups.

