So I decided to get it anyway, and it does support multiple charts per page. However, I get an error.
Warning: unlink(datos81038513.xlsx) [<a href='function.unlink'>function.unlink</a>]: No such file or directory in C:\wamp\www\report\phpdocx\classes\DocxUtilities.inc on line 3320
Any experience with this? Research around the internet didn't wield much results.