Hi cybernet69,
In Place markets the winnings you get are summed up from multiple selections. The way P/L is calculated is different from the win market, that is why you see them as "strange". Dutching works for place markets as well as for win markets, but the principle behind it is different. The program will aim at winning a fixed amount of money from any n winners, where n is the number of winning places.
So you sum up the potential profit from any, say, three selections - and it should be equal to the profit value you set for the Dutching.