As you mentioned a couple of things that – ahem – resonate, I'll chime in. 😀
Over the years I had previously used Herbie's Tenderfeet on a few components (they are dirt cheap compared to most vibration control products on the market), and with some seemingly positive results. But as I upgraded my system substantially over the past year and a half, and moved into a newly renovated home, I was tempted to try to refine the sound further, and did a fair amount of research on various well-regarded devices.
The first one that I bought was a set of Stillpoints Ultra SS V2, to try under my amp. I did this partly because it sits not on a dedicated stand, but rather in the middle of a (low) sideboard which sits between my speakers. Note that I have never used any such devices under an amp previously, but lo and behold, there was a very audible difference with the Stillpoints. I do not assume that the Stillpoints are necessarily superior to other well-designed devices, as I haven't compared them, but decoupling my amp from the furniture had a clearly positive impact, not least of which being a tightening up of the bass. I frankly have no idea why vibration control would be effective under an amp, but it certainly was in this instance.
After that experience, I bought a set of Stillpoints ultra minis, and tried them under my DAC. If there was a positive change, it must have been subtle, and the explanation is likely that the DAC sits on a Quadraspire rack, which does, at least, provide some vibration control on its own. Or perhaps vibration control under a DAC is less important.
Finally, I chose to replace the spikes with IsoAcoustics Oreas under my stand mounted speakers, and, like the experience with the amp, the results exceeded my expectations.
None of the brands/models of devices that I mention are cheap, but within the context of the value of my system, and given the improvements in sound, I would say that they represent excellent value.
So, in your case, I would suggest that the DAC, and any other component sitting directly on the IKEA furniture, would likely benefit significantly from vibration control. I'm happy with the stillpoints, but there are plenty of other options.