If you want to get the best of your transport, try this.

My experience with Herbie's Tenderfeet has been both good and bad. They worked well with my older gear but they tended to muddy up the sound with my Marantz integrated and SACD player. I even tried their footers for speakers (monitors on stands) and got the same results.
Head scratching moment.

I found a slight improvement with some constrained layer damping pads from Les Davis Audio. They are very thin and easy to place under footings. https://www.lesdavisaudio.com.au/

All the best,
Nonoise

Well, they are cup shaped. It could be that the photos don’t depict how deep the cups are. They are convex. And as I mentioned, the older site showed top halves that matched the bottom halves with the ball bearing in between. If you are concerned about it rolling up, over and out of the cup’s lip, then you could ask for a top halve to ease your worries.

All the best,
Nonoise

@uberwaltz,
The site has been updated since I last viewed it and it used to have a top half captive piece as well. I'm assuming it was found to be not necessary or that what you imagine wouldn't happen.

If you think about it, you'd have to push really hard to move the unit and the bearing up and over the lip of the bottom piece, with force many times more than necessary. Anyway, I think you can still order more base pieces to use for the other half.

All the best,
Nonoise

Getting back to the OP's reason for this thread, here's another similar way that is less expensive but seems to do the same thing:
http://www.ingress-engineering.ca/products-and-services.php

All the best,
Nonoise