My car has no hooks in the trunk. So I use some hook spotted on sites and remixed to a universal hook.
You will make hole to the trunk pannel and screw it together with the washer at inside of panel, will hopefully strong fixation.
Not printed yet. I will update.

Print instructions

Remove supports under front curve, other will stay (hook)
Use supports (washer)
No Badges.
Hook - layer thikness 0,2 , 100% infill
Washers - 0,3 , 50% infill
Material - pet-g