German citizen on cruise in Bejing and Shanghai

Cruise ship Celebrity Millenium is coming from Hongkong, Taiwan and South Korea with the following itinerary:
Arriving in TIANJIN International Cruise Terminal on 27 March 06:00, leaving on 29 March 18:00
30 March is sea day, then arrival on 31 March 07:00 in Jeju, South Korea, staying for 8 hours
From there it will travel to BAOSHAN International Cruise Terminal, arriving 01 April 07:00.
Leaving Shanghai to Germany on 5 April 12:35 from Pudong International Airport with an international flight.

We would like to take the train from Tianjin to Bejing and stay there for the two nights in an already booked hotel.
Can I apply in the terminal in Tianjin for a 144 hr visa?

In Shanghai we would like to take the train to Shanghai and stay there in an already booked hotel.
Do we qualify again for the 144 hr in Shanghai and can I apply in the International Cruise Terminal?

If not (either Bejing, Shanghai or both), what kind of entry permit do we need? Single, double, or multiple entry to China?
Thanks a lot for your help.