I think Allgreen Charles may have had a "rug
glide" it's a modified hole glide, where I machined a shallow channel just on the surface of the glide, connecting the dots, basically it allowed hole glide advantage of extraction on thick rugs, without leaving "lines" from the individual holes in the natural fiber.
The naturals are a lot harder to groom than synthetics, actually once dry, it's impossible, you must re-wet them. Not so bad on low pile wools.
Problem is on day to day wall to wall, a Rug Glide will drive you crazy with stray yarns bridging between one hole and the next, the recessed channel is a gather point...so we try to only sell these to rug guys who understand.
This is the root of the problem with John the kiwi, they do too much wall to wall wool downunder, although they don't have "thick carpet" they do have a lot of wool installations, so we make hole glides (for the two guys on this thread) and the rest of AustralAsia with no edge channels, just holes all the way across, not quite a "rug glide" so they push easier, but don't leave much of a pile lifted pattern as well, very similar to a Slot glide but with much less grab.
Same applies to the UK, the slots and holes w/out channels are very popular, the Hydrids are strictly an American thing.
So pick your poison, 80+ models to choose from.