Another isolation accessories which works really well. We tried the deceptively simple looking Big Feet from Scotland and they works great in isolating components from shelf vibrations. Works as well as any we have on hand, if not better.
They are about 2x 2 x 0.5 inch (for singles) thick black cushion built with black Corian (composite inert material) squares containing a 1.5-inch piece of firm but slightly compressible solid material. Various sizes available as well as the non-square Corian surround "Black Ravioli" version.