I found a fake owl I bought a couple of years ago and tried that but no luck. The robin totally ignored it. The next step would be a semi automated owl with a turning head but the nesting season is progressing and the robin comes by less frequently. As I recall robins are good parents so hatching baby robins are likely taking precedent to sitting, etc on the mirrors.
If you park in the same spot everyday, try a weighted owl decoy on the roof.
Or an imitation cat or any real predator. Any fake raptor may keep the robin off the SUV.
I found a fake owl I bought a couple of years ago and tried that but no luck. The robin totally ignored it. The next step would be a semi automated owl with a turning head but the nesting season is progressing and the robin comes by less frequently. As I recall robins are good parents so hatching baby robins are likely taking precedent to sitting, etc on the mirrors.
I think you are correct with the fact that the mirror is a great watch tower and escape height
Especially if the tree nest has eggs or baby Robins. Try a crow decoy at nesting sites too.
The crows raid bird nests for the eggs and the snack inside it.
Maybe the owl is not the best deterrent.
But the cat poised up on the roof might be.