I would recommend your Dac sit on its own shelf.
You might find these two Audiogon Forums interesting:
https://forum.audiogon.com/discussions/isolation-feet-cones-for-ps-audio-nuwave-dsd-dac
https://forum.audiogon.com/discussions/vibration-isolation
You might find these two Audiogon Forums interesting:
https://forum.audiogon.com/discussions/isolation-feet-cones-for-ps-audio-nuwave-dsd-dac
https://forum.audiogon.com/discussions/vibration-isolation