Precision location. what is the best indication?

good afternoon
I have fuel stations and an app for both android and apple. I need to locate the vehicles if they are located on the left or right side of the fuel pumps and how long they are parked. What is the best indication?

I’d try putting one Proximity Beacon on one side, another Proximity Beacon on the other side, something like that:

       |       |
     d | pumps | b
     ^ |       | ^
beacon |       | beacon

Beacons generally broadcast in all directions, but the pumps should shield the signal enough so that on average, if you’re on the left then the signal from the left beacon is stronger. And likewise on the right.

good ideia!! tanksPiotr!!!