How do I Use curved surfaces

Hello,

What is the best way to use curved surfaces, I'm working on a game where you drive scooter over a curved surface it's easy wavy grassy hills. What is the best way to put colliders on this type of surface, so far I'm making empty sprite and using it as tiled background so i can stretch it different way. But I feel I'm using way too much colliders in one level or not? Is there a better way? Also Is there a way I can duplicate multiple objects so they keep form because right now I have to duplicate every time then resize then place and repeat.

Thank you.

To duplicate the object you can use Ctrl+Click and drag, almost sure it'll keep its properties

Make the curved surface the collider.

How do I make curved surface collider, as far as I've found i can have collision polygon with limited points, bounding box or circle as collider.

The best you can do is use a reasonable number of polygon points to approximate a curved surface. It still works well though, I've had no problems doing that.