I have a few questions about Certificates of Deposit in Hong Kong.

Are there any Certificates of Deposit with a fixed intestest rate in Hong Kong?
That is an interest rate that doesn't change since I apply for it (basically like a Time Deposit).

Can the interest rate of a Certificate of Deposit with a variable interest go in the negative? Or is 0% interest the lowest it can go?

What would be a good interest rate for a Certificate of Deposit in Euros in Hong Kong? And how about for one in Hong Kong Dollars?

Can I get the income from the interest rate go straight into my savings account? Or do I need to pay some taxes on it?

Sorry for the silly questions. I do not have much of a financial background...