Actually looked at those before... not impressive at all. If they had made them with inverse construction (ground side connections, end-to-end passthrough connection), you could use them like feed-thru caps. I mean, yeah, you can ground the two ends and use the sides that way, but that doesn't appear to be how they measured it. It's not obvious that it's any better than a pair of equal caps, and certainly not better than two caps and a ferrite bead (now, one cap and one bead, harder to say, but probably also not).
The "high speed" test case is actually rather amusing, because if you look at the (poor resolution) photos of their test board, it's clear that there are many footprints around. They could've used any technology (from 0201 to 1206, single or multi), and with enough futzing with placement, get even better performance. Not to mention the invisible, and far more important, internal planes in the PCB!
For your motor, I'd say, throw down a few ceramic caps, followed by power inductors on the motor side of the wires. Keep the leads up to the motor close together, and mind that both leads will generate RF relative to the enclosure.
Tim