To me, these feel correct:
- They were replaced in-place.
- The dancers twirl in-place.
- Protections are in place.
- It shows squares in place of symbols.
But trying to look for information on its hyphenation, I only find examples of the word combination without a hyphen. (It's hard to find because most search engines, including Stackexchange's, ignores the hyphen and matches cases with a space.)
Are there cases where the hyphenated form is not correct (such as the unhyphenated examples above, where I felt a hyphen would be wrong)? Must some cases be hyphenated, or is it always correct (if potentially less clear?) to write it without hyphen?