After first just leaning against a larger box, where the iPad kept slipping when touched, I considering using a silicone heat brick so it shouldn't slip.
Then I saw this picture frame just laying there, which when flipped around turned out to be almost of perfect width for my tablet. I then found a small box which when turned around fitted inside and gave a good angle.
So for now, until even better ideas arises, this my current stand. But please submit other suggestions as I'd would like to see other ideas (and don't want to accept my own answer :-))