Is it safe to use the Ozzi if there's a gap between the booster and the vehicle seat back?

A small gap between the Ozzi seat base and the vehicle seat back is permissible provided the child does not slouch, can sit properly, and the vehicle belt can be correctly positioned on the child.

Simply push the booster as far back as possible and tuck the LATCH (UAS) connectors into the crease of your vehicle seat, if possible.