Herbies Pucks floor spike protectors...

I didn't know Vandersteen made spike shoes.

A quick Google shows they should probably work as good as my Herbie's gliders, though some may disagree.
Some of this stuff can get a bit anal.
B

I use Herbie’s titanium Cone/Spike Puckies on three sets of speakers. They add a noticeable improvement to the sound quality. Tighter bass with better micro-dynamics. 

In regard to JTCF's post above: I temporally used 8M carriage bolts with my Focal 726-floor standing speakers (two months) while I waited to receive my custom 8M spikes. As soon as I installed the spikes I noticed an immediate improvement with dynamics, sound stage, and bass. I believe you don't know what works until you try it.

I still have some gliders. They didn’t do much for me under equipment rack nor Sound Anchors for my speakers (laminate floor), but they protect the flooring fine :D