they are a non-symetrical twin tip, but they are extermely close to being symetrical, i think no more then 5 mm off
u can mount these at the recommended point or center or anywhere between, it dosnet have to be mounted where the manufacturer recommends
it would definetly preform a lot better in park center mounted, but u better be riding at least 75% park. but not as well on groomers
they will still work acceptably mounted at midsole(manufacturer recomended) but it wont be as easy to carve switch, balance on rails, balance in the air, but will work better on groomers. do this if ur skiing less then 75%park
hope this helps!