A device for aligning and mounting an edge or shadow groove profile (25, 1) of a covering element for a region of a railing, parapet or wall to be covered, comprising the edge or shadow groove profile (25, 1), at least two terminating brackets and at least one mounting bracket, wherein - the terminating brackets are attached opposite each other in the two lateral end regions of the region to be covered, wherein the terminating brackets each have a leg extending forwards, which is aligned to be horizontal or nearly parallel to the subsequently applied covering element and protrudes beyond the region to be covered prior to the performance of plastering works, and the terminating brackets are attached to at least one attachment point in such a manner that the front edge of the leg protruding beyond the region to be covered has a fixed horizontal distance from the attachment point, - wherein each mounting bracket has a leg extending forwards, which is aligned to be horizontal or nearly parallel to the subsequently applied covering element and has a plastering leg extending downwards from the rear end of the leg, which is fixable to an attachment point in such a manner that the leg has a fixed vertical distance from the attachment point, - and the edge or shadow groove profile (25, 1) is attached or applied to the forward-extending legs (20, 22) of the terminating brackets and mounting brackets, wherein the edge or shadow groove profile (25, 1) has at least two legs, which together form an L-shaped cross-section, wherein one of said legs rests on the legs (20, 22) and the other of said legs abuts the front edges of the legs of the terminating brackets, wherein the edge or shadow groove profile (25, 1) forms a plaster connecting edge beneath the covering element. - the terminating brackets are attached opposite each other in the two lateral end regions of the region to be covered, wherein the terminating brackets each have a leg extending forwards, which is aligned to be horizontal or nearly parallel to the subsequently applied covering element and protrudes beyond the region to be covered prior to the performance of plastering works, and the terminating brackets are attached to at least one attachment point in such a manner that the front edge of the leg protruding beyond the region to be covered has a fixed horizontal distance from the attachment point, - wherein each mounting bracket has a leg extending forwards, which is aligned to be horizontal or nearly parallel to the subsequently applied covering element and has a plastering leg extending downwards from the rear end of the leg, which is fixable to an attachment point in such a manner that the leg has a fixed vertical distance from the attachment point, - and the edge or shadow groove profile (25, 1) is attached or applied to the forward-extending legs (20, 22) of the terminating brackets and mounting brackets, wherein the edge or shadow groove profile (25, 1) has at least two legs, which together form an L-shaped cross-section, wherein one of said legs rests on the legs (20, 22) and the other of said legs abuts the front edges of the legs of the terminating brackets, wherein the edge or shadow groove profile (25, 1) forms a plaster connecting edge beneath the covering element.