Thanks for the response. But I’m afraid this doesn’t work.
And it’s not because of the ads not being activated by Google yet, as they work fine if I use them elsewhere.
I guess it’s not possible to use a shortcode in the ad-fields? That way I can use a plugin called Easy Responsive Adsense. But they only provide a widget and a shortcode.
Well, they do offer a bit of code to put in the theme, but I’d much rather use the predefined ad spots you created.