Nadiral orientation Gimbal after takeoff

hi … I have the gimbal Gremsy piloted by Mavlink (No Pwm) and I am trying to have information on how to automatically guide the camera in a position perpendicular to the ground at the beginning of a survey mission
(often happens not to look at the display and therefore to forget to manually orient the room perpendicularly)
I think it is possible, from Mission Planner, to manually include two instructions in the list of operations after mission planning (orientate chamber at -90 ° after take -off and at 0 ° before landing)
However, is there an automatic way to do this without including DO_MOUNT_CONTROL= -90 or 0 degrees ??

Thank you :slight_smile: