I buy freestyle stock pieces and they come with a vague crown, nothing too specific, but they're always in the wrong place, too high on my head.
So I part the hair where I want a crown and make my own.
But again, nothing set or specific.

My suggestion to you would be don't order a set crown and then you still have the option of making your own if you decide you want one.
If you order a set one, you're stuck with it.

For first orders, I think its best to keep as many options open as possible so you can try different things.
Then with later orders, once you've had more experience, you can make more definite choices.