The Modul Panel concealed anchoring system is particularly suitable for fastening rectangular ceramic slabs, installed horizontally. The Modul Panel system involves the preassembly of several porcelain stoneware slabs using metal profiles and special expansion anchor bolts. The panel is then installed on a structure of vertical uprights anchored to the masonry with anchoring brackets and cross members riveted to the uprights. The preassembly stage permits reduced installation times and lower component costs.