Given that when you do dare look they will be doing anything else but paying attention to what is in front of them then the safest place for all concerned is for them to be a close to your bumper as possible.
I reverse onto my driveway, it makes sense because visibility to drive out is limited, 100% of the vehicles on the road are speeding and also its the law although I am the only person to do so.
As I approach the vehicle behind will be on my bumper, we come into a zone 30kph 500m before my place so I slow from 50 to 30kph which further enrages them and they drive even closer, 150m from where I will stop to reverse I start indicating right, slow down even more and 50 metres before put on my hazard flashers, I stop just beyond my drive to reverse into it but of course cannot because I have a fuming Picard gesticulating wildly behind me, in the time that he lets off steam other vehicles will have pulled up equally close behind him so he cannot now reverse, many will then drive onto the pavement to pass and one I memorably T-boned by reversing my trailer into him
Twice in 12 years the person behind has left a sensible distance, has seen the road is clear ahead and has overtaken me while i am braking without slowing down and without being inconvenienced, only twice in 12 years
I feel like chasing them to give them a medal