I generally won’t pay for snake-oil tweaks and exotic cables. However, I really like Center Stage Footers by Critical Mass Systems. Pricing by any standards borders on ridiculous - until you hear what they do. The explanation for how they work is pure obfuscation to me. I didn’t want to like them....
You can find comparisons reviews to Stillpoints. Don’t read them! If you try them, you won’t thank me for this.
Oh, I also like Herbie’s for tube dampers. The footers are ok, but not in the same sonic league, or price bracket as the CMS gizmos. Thank God!