I've found an interesting topic here: need-be-vs-needs-to-be. I also have new knowledge from my book (Grammar In Use by Hewings) that the usage [need + verb] is rather formal and used in formal written English than the usage of [need(s) + to + verb] that means we can use it as a modal verb and an ordinary verb.
Now my main question is about the order regarding the placement of the adverb ever. There's an example on my book that says:
'They need never find out.' (less formally They never needs to know).
Notice that need and never are switched in the second form. And I could agree on that. However, I need to know whether I can write like this:
Nobody need ever know about the money.
Nobody ever need know about the money.