WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
Temporarily tighten the bolt (2)
Fig 1: Rear Seat Back Striker Bolts With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Completely tighten the bolts in the order shown in the illustration.