This type of garage door drive has a ceiling mounted system with a rail track and lift you maneuver using a chain belt or screw drive mechanism.
Mounting a garage door opener off center.
If your door has extension springs the opener must be installed in the center of the door.
Most units hang from angle irons and metal straps that have holes drilled in them at regular intervals.
Attach the straps to the irons with hex head screws.
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.
As you said run perforated angle iron from the center stile to the next stile over.
Bolt the angle irons to a rafter or rafters with lag screws.
Can an opener be offset from the center maybe a couple of feet.
You can t solve you re problems with the same level of thinking that created the problems.
Go ahead and mount it off center and save yourself a headache.
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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You may need to duplicate this for an off center mount.
Use one piece as near to the top as you.
Overhead garage door openers have traditionally been the most common popular option for homeowners.
Offset garage door opener guests.
Attach the straps to the power unit with the hardware provided.
To offset mount the opener arm to the door section.
Overhead opener drive types.