Sorry if this is a bad question, but why is it harder to get a picture at SAC rather than at CAC? And yes, there's a pretty big drought in information when it comes to the PLAAF this year.
A short answer, geography, you can check google earth.
Long answer,
Generally, SAC and CAC are typical Chinese state enterprises, specially military ones. The high raise buildings around the airstrip and factory builds are mostly their own residential and office buildings in case of SAC (and XAC as well). They are only occupied by employees and their relatives, no outsiders. The employees are treated somewhat like military service men. Even their family members are obliged to keep secrets. Outsiders are generally forbidden to get in the complex or must be escorted otherwise. And any outside visiters are registered to the hosts for traceability and accountability.
However, that doesn't prevent J-20 to be spotted in CAC besides the relaxing we saw before. The difference is that SAC is located in a flat landscape in Northeast. The surrounding area outside of the restricted area seems to have less high raise buildings than CAC. Even there are some, they will be most likely blocked by SAC's own high raise. In CAC's case, just outside of the wall of the airstrip it is un-restricted public road and trees taller than the wall, and beyond, commercial residential high raise. You realize that all the unofficial photos and videos of J-31 are very grainy and small, because they are taken from a very far away spot unlike J-20.
But if China does not limit the civilian commercial buildings to "invade" the military's complex, eventually I think SAC would have to more further out. I think it is actually in the plan already.