A quick remix of https://www.printables.com/@Robert headrest hanger to have it stick out less. Thanks for posting the .step file to make remixes easier.
Picture shows the original and the remix.
I printed with 0.3mm layer height and 4 perimeters.
Pictured hooks printed in Prusament PETG Galaxy Black
Original: Car Headrest Hook/Hanger
The author remixed this model.

Shorter version of the original, with a larger radius corner so it sticks out less.