The other approach, based on discussions above, involves Herbie's Hush Puckies on granite. This seems the most logical to me. I was considering actual hockey pucks. I have sent an email to Herbie, no reply yet. As you may have noticed, it is harder to get businesses (or individuals) to answer the phone these days.
Thanks again. I appreciate these and any other suggestions. Will let you know how it goes. (Not an empty promise.)