In most cases, unzipping into a temporary runtime gives you ample time to sort through the folders, make the necessary organizational changes, and then transfer them to their 'permanent' runtime folder.  Whenever I download freebie content, I inspect the actual zip file's internal hierarchy and make the necessary changes there rather than unzipping all the folders to a temporary location.  This way, I have a 'corrected' freebie zip file that can be extracted either through Poser or selective extraction of grouped files to the runtime folder of my preference.  I use WinRAR for this workflow and I haven't had a bad experience yet.  It's surprising how free content zip files are poorly assembled and distributed without thorough testing.