Tesla S Owner's Manual page 34

In the second row, install LATCH child safety
seats in the outboard seating positions only.
Use only a seat belt retained seat in the center
position.
To install a LATCH child safety seat, slide the
safety seat latches onto the anchor bars until
they click into place. Carefully read and follow
the instructions provided by the child safety
seat manufacturer.
Seating and Safety Restraints
Child Safety Seats
Once installed, test the security of the
installation before seating a child. Attempt to
twist the child safety seat from side to side
and try to pull it away from the seat, then
check to ensure the anchors remain securely
in place.
Note: Lower LATCH anchors should not be
used with child seats or booster seats that
have an integrated safety belt in situations
where the combined weight of the child plus
the child restraint is more than 65 lbs
(29.5 kg). In these situations, use the safety
belt instead.
Attaching Upper Tether Straps
If an upper tether strap is provided, attach its
hook to the anchor point located on the back
of the rear seats.
Note: The location of anchor points may not
be readily visible but can be found by
identifying a slice in the seat's material.
Warning: Tighten upper tether straps
according to the instructions provided by
the manufacturer of the child safety seat.
Warning: USE ONLY SEAT BELT
RETAINED CHILD SAFETY SEATS IN THE
CENTER SEATING POSITION.
For dual-strap tethers, position a strap on
each side of the head support.
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