A trunk organizer might be another choice.
https://www.amazon.com/gp/bestsellers/automotive/318295011/ref=pd_zg_hrsr_automotive_1_4_last&tag=m20b7-20?tag=m20b7-20
Can we switch the brake light and turn signal light? Since the brake light has already used red led, it will still be red if put in the turn signal light location. (evil)