Garage Door Opener Low Headroom

You should check the installation manual for the specific openers that you are considering to purchase, and you can very likely do that on the manufacturer's website. You may want to have someone help you check your clearance, so that they can move the door while you measure, as the top corner will possibly be higher at the point where it breaks from vertical to horizontal than when it is in the fully raised, horizontal, position. If a standard opener will not work, and you have torsion springs, there are side-mounted openers as well.