Daily Leverage Certificates (DLC)

Can anyone explain to me how to get the price for DLCs?
https://dlc.socgen.com/en/product/terms/code/CPVW

Lets say I want to long STI tomorrow with 7x leverage, should I be buying at the day before and hold it overnight?
If STI opens at 1% tomorrow, I get 7% (before fees) gain and can just sell on the open?
I can’t be buying at the opening price because if STI does open at 1%, buying at the current price would already have the 1% factored in, and I would need STI to increase by >1% to get any profit, correct?

Thanks

better to ask your broker… its slightly complicated…