I have posted before but had negative replies.
Always thought the passengers in the rear of the four seater vulnerable to flying stones and large bees .
They sit above the windscreen line.
Only in the pre-1999 4 seaters but even then it isn’t as bad as you think. The windscreen deflects things over all but the tallest of rear passengers
On the post 1999 4 seaters, the seats are lower and there aren’t any issues although I wouldn’t go on a busy motorway with my sons in the back