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The bracket serves as a ledge for resting the edge of the Iline mounting pan as the panel is being wrestled on to the studs. After the panel is installed on the studs is is no longer supported by the bracket. The bracket is an install assist and safety feature but serves very little purpose after the interior is fastened to the studs. The bracket is always at the bottom whether it is top of bottom feed.
If a customer accidentally installs the box with the bracket on top it would not hurt anything since the box studs are symmetric. They would just lose the installation assist and safety benefits the bracket provides.