Why would they crash? The panel will be wall mounted. It will have nothing to do with the garage door header so..........
Only you know what your front wall framing with garage door looks like. Normally the walls on the side of the garage door are shear walls due to today's building Code. Depending on your shear wall design and how you mount your panel you
MAY have a crash.
What is a wall mounted panel? In the wall (flush mounted) or surface mounted? If flush mounted then yes you could have a crash (google Simpson Strong Wall for example and you can see that your panel will not fit where the Strong Wall piece is and the header above would kill the bay for running wires upwards). If surface mounted then most likely no problem.
Again - only you know your framing details. Flush mounting or surface mounting of panel is your preference as well as your location as long as your AHJ agrees.
Run your conduit thru what will be the garage door opening and then turn to whatever piece of wall space you want. With conduit and fittings you can surely get the panel where you want it from what ever access point you choose.
