You may stand in any place where a car may park or stop. Except when a traffic sign indicates that it is forbidden for campers to park in the designated area. There are also places specially designated for campers. These places are completely free or you have to pay a small amount. So-called camper places vary from a simple pitch to places where a fairly extensive service is provided, such as: drinking water, waste water discharge, sanitary facilities, etc. There are maps and guides on how to find these places easily.