Webtrekk recommends the use of a central data layer for data collections, in which all relevant information is available (e.g. page name, product name...).
This information is mapped on various parameters in Webtrekk Tag Integration. This means, in which variable of the data layer e.g. the page name is located.
Extensive information about the function and setup of a data layer can be found in a document of the W3C: https://www.w3.org/2013/12/ceddl-201312.pdf