Have you considered other methods of deterrent such as an ultrasonic sounder which may be easier to implement?
You can even use that system on teenagers!
[Teenage Dispersal System.](http://www.abcfireandsecurity.co.uk/Teenager dispersal.htm?gclid=CjwKCAjwpfzOBRA5EiwAU0ccN7FX38b7mlcME6N0F9CQFqKx-GdxiiA9gsjA1kKPPHezlO00HRF68hoCIbMQAvD_BwE)