Mounting systems can releasably secure display devices to preexisting surfaces for convenient installation and removal without external tools. A mounting system can comprise lower magnetic assemblies, upper magnetic assemblies, and a mounting sheet. The lower magnetic assemblies can be secured to a rear surface of a display device, for releasably attaching the display device to a preexisting surface. A bottom portion of the mounting sheet can be secured to the rear surface of the display device, while a top portion of the mounting sheet can remain loose from the rear surface. The upper magnetic assemblies can be provided along the loose top portion of the mounting sheet, for releasably attaching the display device to the preexisting surface. The upper magnetic assemblies can retain their connection to the preexisting surface as the display device is pulled away from the preexisting surface, until a threshold condition is met.