Here is another approach. I use the following for isolation of components and speakers:



You can see from my system view that my speakers are placed on top of the bookcases. I have also had them placed on their sides inside of bookcases.
I have used the cork and rubber blocks for both monitors and floor standers. For the floor standers, I purchase the 12 X 12 block sheets.
The rubber sheets work well under components, like turntables. But these would work on top of a chest of drawers, as well.
My apartment house is on a bus route and alternate truck route, so there are always transmitted vibrations. Both the blocks and rubber sheets work wonders in isolating the components.
Everything was purchased on eBay.
Rich