What isolation feet under your amp with great result?

I have only used one isolation vibration product and that’s the EVP’s. I used these under my speakers. I placed them under the speakers for about a week a just let the music play. I then set aside several hours where I played music I was very family with and would play the music w the EVP’s then remove them and play the music over again. The EVP’s definitely have a positive affect on the sound. When I removed them it sounded as if the life was sucked out of the music. With them the music sounded cleaner(more transparency), more dynamic, just overall more musical. I still would like to experiment with more isolation systems bf making a purchase, EVP’s made me a believer that concept of controlling vibration and its affect on the music isn’t just selling snake oil.