Could one not install both the horizontal (optional) and vertical lights shown and hook them all up to the brakelight? Seems it would be easy and give better visible protection from the rear that you are braking.
https://danasafetysupply.com/whelen...bar-solo-ion-super-led-optional-wecan-rpws50/
https://danasafetysupply.com/whelen...bar-solo-ion-super-led-optional-wecan-rpws50/