Given that your TT is not on a rack designed for audio equipment, it sounds like a good idea. But the only way to know for sure, it to try it.
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The Herbie's "Way Excellent" mat will bring out more detail and better dynamics; plus you can return it if not to your liking.
IME, this mat may not be an improvement if you have a cart with extended highs or sibilance.
As far as footers go, they do not get placed under the stock feet. Place them directly under the plinth; try different areas until you find the best sound.