I have an upcoming trip in September and would like to have Global Entry available then; I applied for it online, received a conditional acceptance and would like to do the interview in Charlotte (CLT) but no interviews are available whatsoever in CLT, so the alternative is to drive to Atlanta, which is silly.

If I just appear in CLT at the Global Entry office, is there a best time (and a worst time to avoid) to try to just do a walk-in interview? I assume that if I appear when the office first opens on a Tuesday-Thursday, I'm most likely to be taken?

In addition, do I need to go through security to get to the Global Entry office in CLT?

Thanks.