Definetly keep your child rear facing for as long as possible. It is definetly much safer.
If your car has LATCH points in the seat byte it also must have a teather point. It is part of the LATCH system.
Very few convertable seats teather rear facing but it is always better to have a forward facing seat teathered if possible. Do read your car seat and vehicle owners manual though for weight maximums for the teather.
This link might help you
LATCH and Top Tether Information for Child Safety Seat Restraints