Will update this with any spots I find.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1854372562
This one is located under the wooden ramp in CT spawn.

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1854374269
This one is located in the middle of the bomb site, on top of a scaffold. Kinda a "You did this to yourself" spot.

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1854376018
Another spot that won't happen in a regular game, but still can be used by trolls. This the hallway right next to CT spawn.

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1854378256
This spot is by T spawn. Again, wouldn't happen unless you try.