Replying to Mounting sollys flat(er) Or....?

So i got some foils...(sick deal, still have my pe's for back up and park) I plan on using them Moslty out of the park, Probably should have just not bought a twin but oh well. So heres the deal,
So I know for park mouting flat is better, but takeing into consderation the semi soft flex of the foil and its semi fat waist (for the EC) How should i mount it up... Heres what i have layin around...
810TI's with axe (plastic crap)
912 Poweraxe E2 Salomons suppostiv "Freeride plate" from a few years ago, Between, The all out plate and the plastic axe there is only about 5mm dif, so not a big deal.
Would the plate help stiffen up the foil at all or will it make it to stiff underfoot compared to tips and tails?
If Flat is still the way to go... Remember East cost, No rails,
How can i mount them Flat? aka... where can i get the little plastic shim thing for the heal, that comes on the new sollys?
Holly shit that was Long..
But, thanks