Not sure if you have bought some plates this afternoon Jeni_R, but I took a couple of shots of the front of my car when I got home. Please excuse the flies - they seem to be attracted to my bumper!
I chose the ones with a border from Europl8 (excellent service and quality plates) and attached them using the 3M tape as suggested by Booth11 above (great advice).
I thought they might help you make your mind up (and I won't be offended if you still go with the borderless ones!)

