What feature is common in dynamic latch plates?

Dynamic latch plates are designed to enhance the safety of child restraints by locking into place when subjected to a sudden pull or force. This locking mechanism is critical in maintaining the integrity of the child seat during a crash or sudden stop, thereby preventing excessive movement that could increase the risk of injury to a child. The feature of locking when pulled hard provides an additional layer of security and stability, making it an essential aspect of the design for child passenger safety.

The other options do not accurately reflect the function and purpose of dynamic latch plates. They are not limited to specific types of seatbelts, can be applicable in various seating positions depending on the vehicle's design, and are not entirely restricted to the back seat.