Luna,
Speakers are designed to be stable, without anything whatsoever.
Some will deliver as option spikes, in order to assure stability where the underground isn't OK, but standard a stabled mounted speaker is as designed and meant.
All the rest of auxiliaries is meant to solve shortages, limitations or problems.
And good decoupling, if all related requirements are met in function of the mass of these speakers, the [g=26]resonance[/g] frequency of these decouplers under that static load, and the stability and mass of their support or stand will hardly, if any, influence the original stability they are designed for.
Acoustics is physics, techniques. Materials whatever they are called, or be, should respect these basics.
You can perfectly decouple speakers not designed for decoupling (how should designers know).
But I linked to other posts, where I explain some of the basics with suggestions. If you take the time to read them and try to understand them, you can ask follow up questions.
I can't help it that the Audio world is so sensitive to magic and that suppliers indeed make use of that.
A lot rather don't give naked data and explain, but substitute that with tempting stories.
The first real question which you should ask yourself is: DO I NEED TO DECOUPLE THESE SPEAKERS FOR WHATEVER REASON?
Such reasons could possibly be:
1) desks starts radiating structural exited sound causing coloration.
2) Increasing TL towards the outside world
3) Whatever other possibility ...
Decoupling them to get an assumed better sounding speaker is a non-argument.
EDITED:
I checked the Auralex site now:
Mopads: Dimensions: 12" long x 4" wide; Weight Limitations: 100lbs.
In fact one can gamble if that's per piece of Mopad, per speaker or set of speakers.
Let's assume that's per speaker 100 lbs = 45 kg/piece
Your speakers are 14 kg/piece
That should mean that these Mopads are seriously UNDERloaded with your speakers, causing them to get a unnecessary high mass-spring [g=26]resonance[/g], which is wrong.
Cutting part (say 60%) of the Mopads away will improve them already for your speakers (but my solution in my linked post is better).
Can you find that on the Auralex site carefully explained? No you just find nothing as explanation.
What you do find is stuff (stories) like this:
http://www.auralex.com/sound_isolation_mopad/sound_isolation_mopad.asp
This is where the Auralex MoPADs come in. MoPAD [g=226]Monitor[/g] Isolation Pads provide sonic isolation between your monitors and whatever your monitors are resting on, INSTANTLY improving the accuracy of your entire monitoring system.
Now what's strange is that I know that foam of which the Mopads are made (if I have the correct type in mind), and there's nothing wrong with that foam in itself (it's good). It's just the way Auralex informs potential customers and readers (for some stuff) which I rate below grade.