Selecting remote door opener where there is restricted space

I have an existing single metal garage door which accesses a shed space.
The door when open fills the shed space. ie when the door is open the top of the door is only 2 inches from the back wall of the shed.
Therefore all the opening mechanism will have to be above the opened door.
There is plenty of head room above the door.
Any suggestions on a suitable electric opener please
Nick

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