A finished monitor arrives in a bezel someone else designed. An open frame display does not: you get the panel, the backlight, the A/D board kit and the SMPS on a frame with mounting structure, and you integrate it into the fixture, kiosk, totem or wall opening that the project actually requires.
That is the normal way to buy for signage, because in signage the enclosure is the design. A retail fixture, a transit shelter and a hotel lobby column have nothing in common except that none of them wants a plastic bezel with a manufacturer logo on it.
Our open frame SETs ship with the mounting structure already on the frame. Light and temperature sensors are supplied as parts, so your installer can position them for the real site rather than accept a factory guess. The customer mount interface is agreed per project.