If structures places data to stack why we do not getting stackoverflow on array of structures?

[Suliman via Digitalmars-d-learn]

> On the heap, unless you are allocating it via e.g. alloca.

If
struct MyStruct
{
  int x;
  int y;
}

MyStruct mystruct;

is located on stack, why:

MyStruct [] mystructs;

should located on heap?