Hi huys,
First of all im sorry to hear about the loss i pray he gets his car back.
Secondly who ever suggested to have a dog instead has indeed offered the most feasible solution to this problem, trust me guys your only security After "Allah" and after "Ayaat al Kursi" is your watch dog, I also own a Gli and it has nothing installed just an ordinary car lock, but a do have a Dog as well and a very well trained one.
i have red above that thieves might even poison your dog which is possible, but it has a very very less likely chance as compare to other thefts, I am not saying that with dogs you are 100% safer but hear me out on this carefully
" ALMOST ALL OF PROFESSIONAL THIEVES WANT TO MAKE THIER JOB EASIER BY NOT GETTING THEM SELVES INTO EXTRA HASSLE AND TENSION, TRUST ME GUYS FOR THEM A CAR GUARDED BY A DOG IS NOTHING BUT EXTRA AMOUNT OF HASSLE AND SO THEY AVOID IT" hence you are saved.
In past i have heard from someone that a group of robbers came to rob a house and just becoz the house owner had a pair of watch dogs they ended up robbing the next door house.
My advice to you all when ever u r in a situation that you have to leave your car unattended for a while anywhere jus read "Ayaat Al Kursi" and blow towards your car, trust me u ill have that feel of staisfaction, rest leave on Allah (S.W.T).
Hpe i made my point