Method of embedding and fixing an anchor rail in a first surface of a solidium, the anchor rail surfacing at the first surface with an anchor rail slot which is designed to securely retain at least one add-on piece with predefined forces issuing from it via an add-on piece connecting means; comprising the following steps: a) determining a position and orientation of a routed slot having a slot length, slot width and slot depth beneath the first surface so as to be able to embed the anchor rail therein in a predefined anchor rail position; b) routing the slot in the predefined position and with the predefined orientation through the first surface into the solidium; c) inserting the anchor rail into the routed slot; d) fixing the anchor rail in the routed slot by means of an anchor rail connecting means which is adapted to connect the anchor rail to the solidium firmly enough so that the forces issuing from the respective add-on piece are securely held; characterized in that e) fixing of the anchor rail is performed by means of the following steps: - inserting the anchor rail in the predefined anchor rail position or a respective drilling jig in the routed slot in a respective position; - drilling, through at least one anchor rail hole or drilling jig hole, of a respective mounting hole into the solidium in the routed slot; and - fastening the anchor rail in the routed slot with the solidium by means of the anchor rail connecting means which is embodied as a screw, bolt, nail or peg and which connects the anchor rail to the solidium through the respective anchor rail hole and the mounting hole. a) determining a position and orientation of a routed slot having a slot length, slot width and slot depth beneath the first surface so as to be able to embed the anchor rail therein in a predefined anchor rail position; b) routing the slot in the predefined position and with the predefined orientation through the first surface into the solidium; c) inserting the anchor rail into the routed slot; d) fixing the anchor rail in the routed slot by means of an anchor rail connecting means which is adapted to connect the anchor rail to the solidium firmly enough so that the forces issuing from the respective add-on piece are securely held; characterized in that e) fixing of the anchor rail is performed by means of the following steps: - inserting the anchor rail in the predefined anchor rail position or a respective drilling jig in the routed slot in a respective position; - drilling, through at least one anchor rail hole or drilling jig hole, of a respective mounting hole into the solidium in the routed slot; and - fastening the anchor rail in the routed slot with the solidium by means of the anchor rail connecting means which is embodied as a screw, bolt, nail or peg and which connects the anchor rail to the solidium through the respective anchor rail hole and the mounting hole. - inserting the anchor rail in the predefined anchor rail position or a respective drilling jig in the routed slot in a respective position; - drilling, through at least one anchor rail hole or drilling jig hole, of a respective mounting hole into the solidium in the routed slot; and - fastening the anchor rail in the routed slot with the solidium by means of the anchor rail connecting means which is embodied as a screw, bolt, nail or peg and which connects the anchor rail to the solidium through the respective anchor rail hole and the mounting hole.