You could use a rubber grip mat or sticky mat in the glovebox area, I've got one and had one in the centre console of my previous car. If you get the sticky jelly rubber mats though, they will discolour in sunlight (mine was clear and turned yellow), I've got a different type now, its like a grey rubber mesh, a whole english pound sterling at Tesco

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Current one is a bit like this
Old one was a bit like this