Hi Tphuang,
I attached a couple of pics with specs on the VLS system. It looks like the missile weight with container is 1040 kg each, and they come in 2x6 arrangement. It occured to me that on the 054A model, the VLS system in the front appears to have 2 sets of 2x6 VLS cels. Perhaps the model maker was emulating the Russian VLS system.
With 24 missiles, that's about 25 metric tons?
I'm not experienced enough analyzing ship structures and such, but I would think sticking 25 metric tons in the area where 054A has the VLS right now will be a lot. Anyways, I'm saying that you can put 32 HH-16 and 16 HH-7 (or 24 and 8 if you only want 32 cells) in the same location that would give better protection and might not even take as much space.
with 16 HH-7, that's probably equivalent to the mass of 2 or 3 shtil missile and the length of HH-7 is about half of shtil.
Thinking back to 052C vs 051C, 051C is probably slightly larger, but 052C has the same number of VLS cells, heavier AShM, more advanced sensor and a hangar.