One can be seen just after leaving the Kunning Gate, that is, just entering the Imperial Garden. That tree is a second-class ancient tree, where Puyi Wanrong was photographed.
The other tree will go north, and when it comes out of Tianyi Gate, it is a first-class ancient tree in front of Qin 'an Temple, which is much larger than the previous one. I suggest you take the best photos in front of it.