Dirty bastiges tried to steal my L.E. lightbar.

[Vettster]

Got to driving down the road yesterday and noticed that someone tried to take the lightbar off.
It has got me thinking about putting an alarm on.
I don't want anything too fancy as I will probably have to get it installed here in Mexico.
What is a good, reliable alarm? There is a local shop here that sells and services Viper alarms.
I have a Viper in my daily driver that so far has been excellent.
Also, do I need an interface?

Thanks in advance.