Sometimes and some places you have to "layer" the theft prevention.
First step is to have hardened steel lock box bolted hidden inside the vehicle with the lid locked with a solid lock.
Next, if it is possible, get 2 spare keys that opens the door only, the no "chip" kine.
Take one door-only key and wire it under your car with stainless steel wire and weather proof with electrical tape.
Hide it good and remember where it is. This key is just in case you lose the other one, it's the back-up.
Take all your small valuables and the regular ignition/door key you use all the time and lock it in the strong box discreetly before you paddle out. Throw your dirty laundry on top of the lock box if you have any.
Take a look around for hoodlums and quickly stash your # 2 door-only key with a magnet box in your secret location under car.
For really sketchy spots, lift the hood like you are checking the engine for trouble and carefully disconnect something that disables engine start up. Just remember what you did. Research first and be very careful with newer vehicles, you might not be able to do this type of thing.
This method won't prevent a break-in, but it might help to slow them down from stealing the whole vehicle.
And with a fancy new car this would be harder to do also. This is just to try and keep your daily driver surf auto in the parking lot till you get back from surfing.
...I am goingoutside now....now you know..... how to steal my car....