How to install the monitoring head on the wall of the movable board room and how to fix it?

Find two square steel plates with a thickness of about 25cm (more than 6mm), drill holes in the four corners of the steel plates, install one in the color steel room, align it, install one outside, pass through it with a suspender, screw the screws inside and outside so that the color steel plate is firmly clamped by the two steel plates, and then weld the camera bracket to the outside steel plate ~ ~ ~