In a real war condition these guns wouldn't be firing side by side in the first place. They have BeiDou, a ballistic computer, communications gear, etc... They would be scattered around an area. Until the 1990s guns were positioned side by side because it removed the need for calculating a firing solution for each gun. Then many types of electronics got cheap enough for each gun to have them. They can calculate their own solutions from downlinked coordinates.I really don't know but could this be propaganda to make world believe it's 9 guns per battery or is it an attempt to show concentrated fire by a Group Army Artillery brigade
Anyone, any takes
Like many military photos, the photo is concerned with looking cool. It is not representative of real practices.