If they satisfy the general Stack Overflow criteria (in particular, if it's not "unclear what you're asking", "too broad", "primarily opinion-based", "seeking debugging help", or "caused by a problem that can no longer be reproduced or a simple typographical error"), and

if it's clearly done within the context of software development (not just "how do I deploy this existing PHP application"),

I would still keep it on Stack Overflow, and tag it with cpanel , so that users who are not interested in such questions can just ignore them if they wish, instead of hunting them down. (Just as users are generally quite happy to ignore questions tags with languages or frameworks they have no interest in, they should be able to do the same with cpanel questions.)

If they're clearly not from a developer's point of view (for example "How do I deploy < some existing blog engine > using cPanel"), I would suggest Super User. Webmasters.SE can also be applicable in some cases, although not everything will be purely web related, as far as I know. In both cases, questions should still adhere to the general quality and answerability criteria, of course.

More generally, I think there's a slight problem in the Stack Exchange model when it comes to being quite restrictive over the subject matter, more specifically about sysadmin-related questions from a developer's point of view. Server Fault is notoriously hostile to questions that don't come from someone performing sysadmin tasks in a professional capacity (as a sysadmin).

Yet, there is a gap for questions from software developers to sysadmins (and quite possibly vice versa), both in a professional capacity. I would argue that some sysadmin-related questions can be appropriate on Stack Overflow, since often developers have to perform a few sysadmin tasks (or at least what settings should or could be used) as part of their development duties, especially for "full stack" developers or in a DevOps context, although I'm not necessarily in favour of a DevOps site (due to concerns over possible over-fragmentation of Stack Exchange).