Hi end turntables probably don't have mats because, depending on all the various cartridge and record thicknesses, there would be a myriad of mats that would be 'best'.
The Funk Firm Achromat is one of the greatest mats available. I have used it on high end Rega P10 and Linn LP12. It DOES a make a significant difference . Bass is tighter and the high notes clearer. The Linn dealer was skeptical and when he heard it he fully agreed that it made a great difference compared to the Linn felt matt. Same for the Rega. On top of it, it reduces static build up. Great product at an affordable price!
The purpose of the platter/mat is to provide a stable surface to mate with the vinyl. The energy induced into the vinyl by the vibrating stylus should be effectively transmitted into the platter/mat. Therefore, soft or pliable mats are a poor choice.
I have found mats of aluminum and copper in combination with center and periphery record clamps to effectively absorb induced energy.
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