If you buy spot A with 1,000 yuan and borrow 500 yuan to buy more, the leverage is 1.5 times, which means 1/1.5=0.66, that is, a 66% drop will cause a liquidation. Do you think this configuration is safe? Is the leverage very low?

Unsafe! One of the positions was only 18% away from 66% yesterday, which is really exciting!