absolute mechanical isolation and decoupling cannot exist in the presence of gravity
You throw this out there to further your self-serving post, intimating that because absolute decoupling is impossible, your way is the only way.
Absolute decoupling is not achievable and not necessary! A resonant frequency of the decoupling device at about 3 to 5Hz will prevent transmission of any musical sound. The rumblings from a nearby volcano might get past the device but then I think you may have bigger problems 🙄
Spikes couple and couple well to a surface and will efficiently transmit vibration in both directions.