We rent, and have no off street parking. My car is new, and has been untouched the past year. But my partner's and neighbours' cars have been broken into 9 times now.
We live down a quiet cul de sac in Royal Oak, however as we are near a school that gets used quite a bit for touch etc, it's a bit busier than it normally would be for a dead end street.
My partner's car is a mid nineties POS Daewoo, it's worth nothing, has nothing in it (stereo doesn't even work) but the glass takes a month to order in. It's just a pain, I'm not interested in any vigilante type stuff. More just helping actually catching the buggers.

This morning was unusual in that at 5.50am, my car alarm went off. I looked out my window (as I can see the street) saw nothing, got up and flicked the alarm off using the keys. It wasn't till I was putting the bins out that I noticed the 3 cars with smashed quarter windows, and one neighbour had the added bonus of the front drivers window being smashed in too. I wonder if they tugged the door handle on my car. The alarm very rarely goes off.

The main problem I guess is the street is quite dark. Are there cameras that would work in low light that I could mount outside the flat and back up to our wifi? Our wifi actually reaches the cars if that's of any use. The other option is a grunty security light on our place, but I'm fairly certain the sensor won't reach that far, plus we don't really want it going off every time a car drives down the street.

I think the best solution (other than moving, when we find a house we want) is to simply put a blinking LED on the Daewoo's dash or just leave it unlocked. But it grates me that they're continually doing it. The last one was 4 months ago, on a different day, so there's no real pattern other than they are quiet (I'm a light sleeper) and doing it early in the morning.
Our cars park usually over the road (mine is the black sedan and partner normally in front of it)