Array of VL53L0x sensors
A look at the datasheet shows a few significant parameters:


The measurement angle, which is 25 degrees. You'll need to determine whether this gives you enough detail to make the measurements you need.
The accuracy, which seems to vary according to distance but they give values from 3% to 12% depending on distance and other conditions, again, you'll need to determine whether this is sufficient to resolve the "slight" differences in distance you're looking to measure.
The typical minimum (8ms) and maximum (23ms) times it takes to carry out a measurement. You would need to make sure you don't carry out measurements at the same time using sensors whose fields of view overlap with each other, and that depends on their physical positioning. At worst case, with 8 overlapping sensors, you would be able to carry out about 5 measurements a second if you carry out each one in turn, so you would need to establish whether that was quick enough to pick up any movement you are looking to measure. The best case is that the sensors don't overlap at all, so you can measure continuously (in this case, that means upwards of 40 times a second).