Poland-Hong kong to Zhuhai

Hello , can you please advise me with some informations regarding visa. I would like to make sure i am right :
I am Polish passport holder traveling from Poland(via Amsterdam ,Netherlands ) to Hong Kong and then to Zhuhai for AERO show in China in November. I just need the visa on arrival which is valid for 3 days . I will come to Hong kong and the same day to Zhuhai at 22.11 ,and then at 25.11 I have to leave Zhuhai .
Thank you for your answer