"English is not mine or my DH's first language and I do not feel confident helping editing."
It is challenging, because the application will personalize him and his background, so you don't want him to lose his voice, a voice that is consistent with his experience, but you want him to persuade the AO he should be admitted. I would emphasize the retention of his personal voice in any selection. I would specifically ask a perspective editor about how they would accomplish this.
As for what specific schools want, perhaps you have already done this, but I would do some online research to educate myself before selecting someone as well. There are a lot of online college consultant videos about what specific schools want, and the videos usually include a presentation about how to write the essay (but note, the questions may have changed since the release of the video).
Here is an example for Purdue, take it as you will in terms of credibility:
https://www.youtube.com/watch?v=E5SmMV9-UbM
Start at 5:02 for the essay discussion.
Here's another one for VT:
https://www.youtube.com/watch?v=bweI-0-svzk
These are just 2 examples from one consultant, consider them with a critical eye, and I'm sure there are others.
Again, a place to start if you haven't done this already.