> I find it strange that others haven't encountered this problem.
That's because most people that use Admob design their layout so there is no overlap. Is there a reason your buttons need to be so far down on the layout?
It's not about the buttons. It's about the whole design, meaning background with buttons or whatever someone may want to put.
Of course I can push everything up, at least the buttons but the background has to be in the right size always or it gets overlapped.
For example my project is 1280x720.
On my xperia zx1 I had to leave at about 104px so that the banner does not overlap with the background.
That is more than what is suggested here: