For me, it's a decision on whether to drill the body, or use a tail lamp or (for some Barracudas that have them) a back-up lamp like the car above.
On a '68 Road Runner, I went through the back-up lamp lens and used a rotary switch.
On an early B, I made a bracket that attached to a bumper bracket.
My Duster already had a hole below the trunk lock from its SS days, was never - and never will -be a street car or a restored #s car, so that was easy.
If there's an opportunity to be clever & artistic, I try to take that route - as long as it doesn't confuse or irritate the Tech guys.