To correctly install pavers there are a series of steps you must follow. Step one would be to excavate area of project. Step two would be install aggregate layer. Step three is to compact aggregate layer. Step four is laying down bedding layer and lay pavers down. There is also another process for installing over existing concrete. You need a four inch thickness minimum over the area. Please visit http://www.belgard.com/blog/2017/07/18/installing-proper-base-concrete-porcelain-paver-projects/ for exact reference if needed.