Something nice for Stabi S and older Stabi decks: an aftermarket sandwich platter by a local specialist.
I have one for more than a year and it strongly improves detail and dynamics. However one has to be careful because the deck needs a good re-tuning and a precise VTA re-bias (if you don't take care, you may end with bright and dry result).
It's enough to use a normal felt mat, no need for anything exotic.