As you said run perforated angle iron from the center stile to the next stile over.
Mounting garage door opener off center.
Most doors are reinforced for the operator to mount in the center.
Some of the door openers especially commercial brands mount along side of the door on the wall and may work if you can find one that is cost effective.
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Lift the power unit.
The greatest guide to how to fix a garage door that s off track giel garage doors if your garage ceiling is completed you can mount a 3 4 inch plywood pan.
That means the garage door opener won t work if it is placed in the center of the door.
Set it securely on top of a stepladder so it s conveniently close to the ceiling.
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To offset mount the opener arm to the door section.
You can be off center with the opener provided the door has a torsion spring which it sounds like yours does if your door was extension spring the kind when the spring stretch along the horizontal track then it wouldn t work properly.
Use one piece as near to the top as you can which would be.
Can an opener be offset from the center maybe a couple of feet.
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If your door has extension springs the opener must be installed in the center of the door.
The opener can be installed within 4 feet to the left or right of the door center if there is a torsion spring or center bearing plate in the way of the header bracket or door bracket area.
You may need to duplicate this for an off center mount.
Go ahead and mount it off center and save yourself a headache.
The exact location depends on the type of door.