“otherwise directed” vs. “directed otherwise”?

Question

I've seen conflicting usage of the two phrases below, and I wonder which is grammatically correct and why:

1. Do something unless directed otherwise.

2. Do something unless otherwise directed.

Answer 1

I think in this case, "otherwise directed" has become a standard idiomatic construction--but both are acceptable.

Contrast this with:

Do something unless you are told otherwise.

Do something unless you are otherwise told.

Here, the former sentence still sounds okay, but the latter sentence sounds unnatural.