If I have two different websites, do I need a separate subscription of Trustlytics for each website?

Yes, in order to analyze two different websites, two subscriptions from Trustlytics are required. Each Trustlytics subscription can only analyze one domain. For example, if you have a website with the address https://www.my-private-website.com and another website with the address https://www.mycompany.com, then you need to subscribe to two separate Trustlytics subscriptions.