Toyota Lexusc Owner's Handbook Manual page 255

OCCUPANT RESTRAINT SYSTEMS
D If the driver's seat position does not allow sufficient
space for safe installation, install the child restraint
system on the rear right seat. Child restraint system
installed on the rear seat should not contact the front
seatbacks.
236
"
1 Same position 2 Same angle
D When installing a child restraint system in the rear
center position, adjust both seat cushions to the
same position and align both seatbacks at the same
angle. Otherwise, the child restraint system cannot
be securely restrained and this may cause death or
serious injuries in a collision.