Regarding the FPS, the fundamental issue here is that you need a screen protector that will bind to the case with no air gap. If you go with a wet or dry apply, the protector physically binds to the screen (via adhesive and soapy film, respectively), so the FPS will work. If you go with a tempered glass screen protector, Whitestone Dome is your only option since it uses an epoxy that cures under UV light to bind to your screen. A screen protector like the one you've linked to doesn't bind to the screen by any physical mechanism, so I don't see how it would work. I could be wrong, and maybe you'll be OK. But based on what I understand about the FPS, it doesn't seem like this screen protector will work.