Are flexible screen protectors for BB Z30 supposed to go edge to edge?

Just received from CitiGeeks (Oakville, Ontario CANADA) anti-glare premium HD screen protector. Noticed it does NOT go edge to edge on screen, rather it leaves a few milimeters around the periphery. Is this correct? OR, should it in fact go edge to edge. Thank you.

I've never used one that actually went edge to edge.... not sure I'd be able to match it up that closely.