Amp,
For what its worth...take my advice and take your cat(s) to a vet...I did it when I went to AZ a few years ago...
It's HELL-A easy and takes like 30-seconds for the vet to inject the chip behind the base of their head...in the same place where you'd pick a kitten up from...
Minor paperwork but WTF...and depending on what vet you see or go to...it's only a few bucks...shit..what am I say..you can afford it! LOL
Cool thing is if it ever gets lost...umm....the cat that is and not the chip...and get's picked up...they'll know where to send it back too...
Then again, if the facility the cat is taken too doesn't check for 'chips'...then you're RFUTA....
TekArt