I'm pretty sure you don't want grip inside your board cases....
Carpet is a **** solution, it perishes in the sun (I know there is limited sun in the uk...) but it's much better to use Teflon selfadhesive strips. The boards go up and down under pressure much easier and it won't hold sand like carpet does.
Macca
The thing is that Stealth plates are so light they float up if not HELD down!