Canadian spec child car seats have a "tether strap" which is like a seat belt with a steel hook. It attaches to the back of the car seat, and then hooks through the anchor point.
Then, you pull the strap tight. This provides additional stregth over the car's seat belt. Most of the world has tether straps as mandatory.
The anchor point varies from car to car, but in MB sedans it is in the parcel shelf, and through the steel of the rear bulk head.
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