Kinda of hard to see...but mine has been on about a year now....you can get actual grille emblems with little pegs on the back...but mine is like yours...hasn't fallen off or even come loose.
I also have one on my rear end...
Mine is debadged as well...just get fishing line...leave your car in the sun or heat up the emblem with a hair dryer...then cut behind the emblem with the fishing line til it comes off. Get goo gone and soak it on and get the rest of the tape/glue off, then wash and wax the area.