IMO, it really needs to be a visible place with an associated piece of furniture. Otherwise, the process just isn't discoverable: If the store is busy and both

IMO, it really needs to be a visible place with an associated piece of furniture. Otherwise, the process just isn't discoverable: If the store is busy and both people are already talking to customers and then a third one walks in, that person is going to walk straight past them, possibly bounce off the genius bar at the back, and, if they don't have an assertive personality, spend a few minutes just sort of standing there looking helpless before quietly leaving. Stick a small table or lectern with an "Information" (or whatever) sign above it in a clearly visible place, though, and then they'll just go wait in line there.