I think alarm no use, they will just tow your car away. Best practices so far i think is to park head-in with steering turned to one side and use steering wheel mechanical lock...
er...are you sure like that people can't tow it away? I doubt so man....
try that with unpaid/illegal parking in JB, MPJB damn fast one lor.....then you gotta go Majidee there to collect your "forced towed" car lol!
