I don't live in NYC, so maybe I am, but it is sufficient for my purposes.
$10,000? Someone's $1,000 bike may mean more to them than your $10,000 bike does to you, I have the same alarm as ChezCheese and think it's a good deterrent. Nothing will stop someone who really wants your $10,000 bike, lots of videos to prove that.
I got my alarm just now. It did fit under the seat also. You are correct. Very tight fit.I use this one: https://amzn.to/2H85KEl. I have it underneath the seat, and it was a very tight fit (I had to remove the back cover even). No way anyone can remove it. It works great! Gives me peace of mind knowing that if anybody messes with my bike in anyway, that alarm is going to make it very obvious. And people dont expect an alarm on a bike, so it really startles.
Perfect fit.Under the seat (upside-down with the back cover removed) works very well. Totally invisible and protected.