They're asymmetric and can be rotated left to right.
I just put mine back on for the season today as temps are now in the 40s and I was definitely noticing traction loss with my PSS the last few days. Going back to the PA4s, in the dry they do squirm a little given the added tread, and lateral grip is less, but so is my contact patch. I'm glad to have these tires for the winter.
This year my 18x8 ET20 wheels have 15mm spacers rear and 12mm spacers front. On my stock ZCP suspension, the fronts surprisingly rub the liner a small amount on turns. Oh well, it looks pretty good so I'm a stick with it.