After I retired I worked just 2 days a week at my local B+Q store. One of the lads working there had been given a 3-series BMW by his parents. He always used to park his car at the furthest point from the store and over two parking bays to 'protect' his car. Now a B+Q car park has all sorts of nasty things in it, nice cars, old wrecks, builders vans and trucks, trolleys with all sorts of heavy goods etc etc. I used to park my car in just one of the normal spaces quite close to the store entrance and in the 3 years I worked there my car was never damaged at all. In fact I have never had any damage to any of my A3s in any car park over the 10 years I have driven an A3 and I always park in any normal parking space. Never over two spaces and never in the far corner or anywhere well away from the other cars in the car park. It makes it stand out too much.
In the time I worked at the B+Q store there was only one car belonging to a member of staff that was damaged at all by another drivers door or similar and it was the BMW parked in the far corner. Obviously someone decided, on purpose I should think, to target this car and opened another door against it and made quite a dent in the door.
So perhaps the moral is, don't make you car stand out by parking it away from most of the others. If there is a choice park next to a similar standard of car rather than an old wreck but don't be paranoid about it.