Ford MUSTANG MACH-E 2022 Supplemental Owner's Manual page 21

Child Safety
If the booster seat slides on the vehicle
seat upon which it is being used, placing a
rubberized mesh sold as shelf or carpet
liner under the booster seat may improve
this condition. Do not use any item thicker
than this under the booster seat. Check
with the booster seat manufacturer's
instructions.
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2022 Mustang Mach-E (CGW) Canada/United States of America, enUSA, Edition date: 202109, First-Printing