The concept works with amplifiers as well. Removing the field created by transformer always reduces circuit distortion. Isolating the fields in a power cable also is extremely effective.
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I just went through this same experiment with my VAC preamp. When I purchased the preamp I put the power supply on a piece of vinyl cover MDF left over from an old set of speaker stands that needed to be taller. It sounded great and after almost a year I wondered if it could be improved upon. All platforms tested are approximately 6x9 inches and from 3/4 to 2 inches thick. I tried slabs of granite, John Boos cutting board, solid cherry, and solid oak, with and without Audio Points either between the platform and the floor or between the power supply and the platform. In the end, I preferred my original platform sitting directly on the carpet as before. Each material had a definite sonic signature. The granite had the tightest bass and lower mids at the expense of top end extension and the oak was a satisfying all around but I still found my original platform the best compromise for me, and they all compromise something somewhere and you need to decide what is most important to you.