I have those on a sub. They work well. I’m also wondering if you should just consider a yoga mat or other rubber floor mat and cut it down to the dimensions of your speakers’ footprint?
For cheap and effective i like to use bench cookies. You will need 6-8 depending on your speaker size for 2 speakers. Since you are not looking to lift them much no accesories to raise the height needed.
There are rubber bumper pads, and much more expensive things you can buy. I have also used yoga blocks, yoga matts, rubber feet for furniture and very expensive audio products. YMMV.
Not a very popular speaker, also not much liked i think. These were an absolute steal when they went on sale, beautiful wood, and they sound amazing when pushed thru audio gear. They soundstage and image incredibly well, go low enough, sparkle, play with detail and happen to work damned well in my particular set-up. I’m so very happy i thought to try them next to my desk that one day 2 years ago, they have not moved since and i use them for all my pop, rap, edm, techno dubstep etc. styles of music along with others but they excel at “FUN”.