A mounting device for positioning and securing a sanitary appliance , in particular a toilet bowl, said device comprising at least two or exactly two mutually spaced vertical struts , wherein the vertical struts are connected to one another by at least one or exactly one single hollow body and wherein the hollow body comprises at least one securing element , by means of which the sanitary appliance can be secured to the mounting device , wherein, in respect of the at least one securing element , the hollow body extends downward in the installed position, wherein the hollow body is made of metal and is connected materially, in particular by means of a welded joint, wherein the front surface of the vertical struts defines a front plane and the rear surface of the vertical struts defines a rear plane , wherein the hollow body lies between said two planes or is congruent with said planes, wherein the hollow body has a front wall and a rear wall arranged at a distance from the front wall , which front wall and rear wall are connected by means of their lateral edges facing the vertical strut to the respective vertical strut , wherein the front wall and the rear wall are connected by at least one reinforcing profile and/or at least one reinforcing rib , wherein the hollow body comprises an aperture , which provides a free interspace through the hollow body , through which a drainage pipe can be passed, wherein the aperture is V-shaped or trapezoidal and, in the installed position, extends into the hollow body from below, wherein the aperture is arranged in such a way that the hollow body has a web region above the aperture and wherein the reinforcing profile and/or the reinforcing rib extend along the free lateral edges of the frontwall and the rear wall , which are not connected to the vertical strut. at least two or exactly two mutually spaced vertical struts , wherein the vertical struts are connected to one another by at least one or exactly one single hollow body and wherein the hollow body comprises at least one securing element , by means of which the sanitary appliance can be secured to the mounting device , wherein, in respect of the at least one securing element , the hollow body extends downward in the installed position, wherein the hollow body is made of metal and is connected materially, in particular by means of a welded joint, wherein the front surface of the vertical struts defines a front plane and the rear surface of the vertical struts defines a rear plane , wherein the hollow body lies between said two planes or is congruent with said planes, wherein the hollow body has a front wall and a rear wall arranged at a distance from the front wall , which front wall and rear wall are connected by means of their lateral edges facing the vertical strut to the respective vertical strut , wherein the front wall and the rear wall are connected by at least one reinforcing profile and/or at least one reinforcing rib , wherein the hollow body comprises an aperture , which provides a free interspace through the hollow body , through which a drainage pipe can be passed, wherein the aperture is V-shaped or trapezoidal and, in the installed position, extends into the hollow body from below, wherein the aperture is arranged in such a way that the hollow body has a web region above the aperture and wherein the reinforcing profile and/or the reinforcing rib extend along the free lateral edges of the frontwall and the rear wall , which are not connected to the vertical strut. <EOS>