Tesla MODEL X 2015 Owner's Manual page 50

Child Safety Seats
Dual Straps - Third Row Seats
Single Strap - Second Row Monopost Seats:
For single-strap tethers, position the strap in the
outboard seating positions over the outside-facing side
of the head restraint (in other words, on the same side
of the head restraint as the seat belt retraction
mechanism). In the center seating position (if equipped),
center and position the strap over the top of the head
restraint.
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Single Strap - Second Row Bench Seats:
For single-strap tethers, position the strap in the
outboard seating positions over the outside-facing side
of the head restraint (in other words, on the same side
of the head restraint as the seat belt retraction
mechanism). In the center seating position (if equipped),
center and position the strap over the top of the head
restraint.
Single Strap - Third Row Seats
For single-strap tethers, position the strap over the
outside-facing side of the head restraint (in other words,
on the same side of the head restraint as the seat belt
retraction mechanism).
MODEL X Owner's Manual