Sorry for the late reply.
Each product is tied to your cTrader ID which you can install on multiple machines. If you are trading on behalf of other traders, it would be best if they purchased the products so they can manage their licenses. But you can also purchase the products, in this case, you would need to give me their cTrader IDs and I will register them. If you are going to manage 3 accounts, you will need to purchase the product 3 times.
https://help.clickalgo.com/account/registration/#license-faqs