No need to UV unwrapped the object and no need to link to external image texture.
Fully Procedura photorealistic and detailed materials for Blender 2.82+. The group node give you only the parameter to get realistic render.
WHAT WILL YOU GET?
.blend file with a complet PDF notice on how to import the node group or material on your current work. A simple way to play with a complete parametric geometric generate floor tile shader.
Work with Blender 2.82 +