Install junction box with the border close to, but the junction box must not reach the aluminum edge of the bounding box. Junction box margin not to qualify
Mounted junction boxes can be infinitely close to the border, but the junction box must not reach the edge of the aluminum frame. Edge junction box can not be pressed to qualify
A good junction box can be infinitely close to the border, but it can not reach the edge of the aluminum frame. The edge of the junction box is not pressed to the outlet