Nope with a determined thief who has weighed the risks and understands alarm systems.. for the most part nope they wont do anything.
Spend the money on the install rather than the hardware and it might be a different story. Like have the installer pull out the dash and install it behind there, rather than cable tied to the steering column like most systems. Have them use factory relays, kill switches, piezo sirens inside the car. There are many ways to skin a cat.
At the end of the day they can always tow truck your car away, but that's pretty rare compared to opportunity thefts, and that's what we should be paying our installer to prevent.