Mats only do so much for static mitigation. You know what kills static? Turning your heat down, no socks on carpet, and humidifiers. If a record is charged with static and you want to de-stat it, a Zerostat gun, either a commercial one or a DIY version works.
Re: your other problem, instead of a band aid fix I hope you got the turntable away from the amp. Instead of wasting money on a mat, look at getting a system rack, either commercial or make your own flexy type or cinder block and plywood rack. Get your components on separate shelves and the amp on the bottom - turntable on top so the amp is far away from the TT.
If a turntable comes with a rubber mat, it's usually to damp the metal platter. I see a lot of hokum and overpriced mats on the market that produce questionable benefits. Some of the ones made of a foam material or a rubber/cork combo might be an okay replacement for a stock mat if your stock mat is really ruined. I would try to make sure it is the same thickness as the stock one, particularly if your arm height is not is not adjustable (consult your manual). If you are looking for a magic mat that kills 100% of static good luck.