85% of the rated power of transformer is the maximum load of users, which can not be exceeded in theory.
10 model 1230w, transformer 1500x85% efficiency = 1275w, which is close to the critical value, as long as the transformer temperature is normal, it will be fine.
If you don't want to take risks, just choose 2000w w W.
Transformer 2000x0.85= 1700w, and both rice cookers are suitable for use.