As long as they've got nice tight hides to cram into, they'll feel safe while still having the opportunity to roam in the middle of the night when they feel the urge to do so. They look alright to me.

I wasn't trying to knock your setup or anything, I just thought I'd point that out because I know of people who I've tried to help troubleshoot issues with mites to no avail, only to find out later they had a custom cage built out of plywood. Its just something really commonly overlooked.