Orient long hole structure to surface edges

Hey guys,

i had a similar problem with circles on surfaces before. Now im trying to orient the longhole structure to the edges of the surface. I dont want them to cut... i want them to stay intact (hope you understand what i mean). I already tried to create the lines and Points directly on the surface but the result of the structure was bad since the surface is not a rectangle. I just want the holes to "flow" nicely into the edges. Do you have any ideas? Thank you!

best regards from Germany :)