Try it both ways! You might also consider trying other mats.
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flashcider, the goal is to keep the record from resonating and slipping on the platter. A record weight will stop the record from slipping but the problem with a hard platter surface is that it has a much different mechanical impedance than the record thus it will not keep the record from resonating. You want a mat that has a similar mechanical impedance to vinyl then it will serve to dampen any resonance in the vinyl. The Funk Firm Achromat get high marks for this and I would absolutely consider getting one of these. People love them. If my turntable did not come with an excellent mat I would definitely consider getting one!.
While I do not believe personally you really need a mat with the acrylic platter the 5mm Achromat is a great choice, had one and used it for years and yes I ordered from a dealer in England too.
Just remember though you are now adding 5mm to the height your record is sitting at relative to the stylus so you will need to adjust vta to suit
@flashcider - I place the record directly on the acrylic platter, BUT I also use a Thorens Stabilizer to prevent any slippage, which can occur on some albums, where the pressing is not quite PERFECT.
The benefits of the weight - a much "crisper" dynamic presentation
Regards - Steve