Terrain Follow for Mapping missions with Arduplane. Will map stitch properly while maintaining GSD?

Hey there,
I have a X-UAV Talon with extended wings for photogrammetry projects of large area.
This next project has a hilly terrain with relative altitude change of around 100m. The height for missions is 150m.
I have never used terrain follow feature for mapping missions but it looks like this mission will require terrain follow feature so as to maintain required GSD.

My question is
If I use terrain follow feature will it affect the quality of images as I don’t have gimbal installed for the camera?
My main concern is that will it have enough overlap to produce map while maintaining GSD.

Any help is appreciated.
Thank you for your time and consideration.
Shubham Thakur