If you need a simple self closing drawer here’s what I did and it works very well.
We have earthquakes in the North West on occasion: hopefully just little shakers and the more often the better so they aren’t real big ones. When we come home we have to straighten pictures on the walls and close drawers that shook open. see my cabinet project http://lumberjocks.com/assets/pictures/projects/23536-196x130.jpg?1207733781
Our bathroom has a counter that is right tight to the door opening and if the drawer is open; the door can’t be opened! So I mounted the runners on my drawers at a slight angle and they self close. Make the drawer sides a bit “skinny” as the drawer moves uphill as it is opened. These are full extention “Accurides” and roll very nicely.