Well, in this case that test would be impossible to do, because I cannot know when the clicks will be generated on the banners, and as you will understand, I cannot change the web for a long time for that.
Can you think of any other way to check it?
On the other hand, if I want to add a Facebook pixel in the header of the site, and I have the Child Theme activated, where exactly should I do it? will it not be erased when updating the template?
Thanks