This is a simple bracket that attaches into the headliner over the rear trunk area.  I can then tape the metal plate for an under-cabinet magnetic light to this instead of directly to the car/headliner.  I've found this useful when camping and I keep the car lights disabled in camp mode (power OFF) but still want lights in the trunk area.  They're also motion-sensor, so they come on when I approach the trunk area and stay on while I'm moving around.  These are the lights I purchased off Amazon, if you're curious (not an affiliate link or anything).

I printed 6 brackets total and combined 3 for each side.  I then attached the metal plate to each set of 3 using the included double-sided tape.  So far it seems to be holding up.  Most of the time I keep the light turned off, but even in "auto" mode (motion activated when its dark) it doesn't seem to turn on while driving (which means it doesn't "see" anything moving outside the windows).  It probably would trigger if things were moving around in the trunk area.

When installing these, you can just pull down on the headliner.  There are a couple of magnetic clips that hold it up roughly where the two lights are.  So pull down in the middle and the magnets will pop free.  Then just slide these on and position appropriately.

Printing

You should print these on-edge for the best strength.  I printed 3 for each side (6 total), installed them in the headliner, then attached a metal plate to each set of them.  This let me print it on it's side but not have to print as tall.

• I used PETG.  Use something somewhat heat resistant.

• It should be all perimenters, so default settings should be fine.

• I painted a seam on the edge of the upper lip so there were no possibilities of breaks (see final photo).

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