It may not need to be perpendicular to the longitudinal center line. Most planes have built in down and left thrust. This is to offset torque and the center of drag being higher than the thrust line respectively. Most high wing planes have down thrust. So don't assume it needs to be be fixed. Is that a factory install or did you install the motor?
It's not supposed to be. The motors make too much torque for the size of the plane. If there aren't canted properly it becomes uncontrollable or you need to use all your control authority just to maintain level flight.
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