+1 on what Kenny has shared.
I went with Herbie’s Giant Threaded Stud Gliders based on recommendations from folks on the thread. To very good results.
Like Kenny, I also went with a 1-inch length but you can go to the 1.5 inch length if you would like to adjust / tilt the speakers slightly. I am also using two sets of 4 Herbie’s Giant Gliders under isolation shelves; the DIs with the screwed in Gliders rest/stand on top of the isolation shelf with gliders. To my ears, this really brought ’more’ out of the isolation efforts. I also believe raising the DIs a bit off the floor will result in gains. My floors are bare hardwood (oak).
There are other brand approaches to consider as well. Soundocity has products that folks here are also using to good effect. They are also reasonably priced.