I have now tried, and it works absolutely great.
For beginners and amateurs like me - my short tutorial:
In the example, the lower part of the parts to be assembled by means of the wood drill bit to drill holes - center yes, but the distances between the holes are arbitrary and need not be accurately measured.
In these holes the anchor Fixe with the tip pointing upward (is not different) set.
The fixated on wood piece Carefully correctly put on the line, where it it is later, then beat fairly firmly on top with a cushioned possible hammer so that the Dübelfixspitzen press and no longer slips the piece of wood.
Remove now the plate again. We now find the small holes that have pressed the anchor Fixe - possibly you have it eg with chipboard make it clearer with pencil.
Into it the opposite drill holes.
Then insert the dowels - well - and with my two boxes of the dowels flutschten wonderfully on both sides into the holes; the upper one with 6 anchors on three sides.
I never thought that this could work so well.