When should I use the rear-facing lock-off?
The rear-facing lock-offs are ONLY to be used when installing Fllo rear-facing with a lap/shoulder belt. There is no preference for which lock-off you use, you may choose whichever one gives a better fit. Use only one lock-off at a time.
If your vehicle belt is equipped with an ALR retractor, you may bypass the lock-offs entirely. Check your vehicle owner’s manual to see what type of seat belt system your vehicle has.