[Tranas]

I really like the one on the right the most.
I couldn't say where I'd put it though, such small decals - hard to say.

Maybe to the right of where the driver side rear-view mirror lies, below the window?

Not really sure where the best would be. I'd probably steer away from the rear though, just because it's size would make it feel like a bumper sticker (of which I try to steer away from) to me.