你认为如何 - More like a Chinese guy would talk like that.
如何你认为 - Feels like the English sentence. *Like the sentence start with "What", "Which" etc.
So both is correct?
Especially to express:
What do you think...
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The first is correct but the second is wrong.
However, even with this said, you may hear the second sentence from native speakers in casual conversations. As I mentioned in this answer, some people tend to reverse orders while speaking. For example "山东人我是". But don't get me wrong: this sentence is not correct and you should not say the same. However, just don't be surprised if you hear some native speakers make the same mistake.