Hi Milko,
welcome to this forum.
At DarwinexZero (the subscription version of Darwinex with demo accounts) you can only open one account for each user and email adress.
If you want to open real accounts and deposit real money, you can open them all under the same user and the same profile and email adress.
But be ware that you have to fund every account with (more than) 1,000 EUR if you want to share the DarwinIA contest.
If the minimum equity is less than 1,000 EUR anytime during the month, you will be excluded from DarwinIA for this month. That's how I read the rules.
Details about the DarwinIA participation are here to read
We allocate up to €10M to 150 DARWINs each month and maintain the investment for 6 months. We pay 15% on 6 months profit * €10M = €60M invested in customers.
www.darwinex.com
Every Darwin is related to one trading account.
If it were my decision, I'd try to find out whether the strategies are correlated or not.
If they are uncorrelated, they could smooth the drawdown of your Darwin, if they are correlated, the effect for the Darwin is small and it might make more sense to offer more than one Darwin.