Easy way to place and adjust a texture ignoring mesh geometry?

Hi Matrin! Sorry, I will try to explain
1. I need a specific angle of view for this pack, so I setup a camera and adjusted it.
2. Now I need to apply a texture with graphics, but I don’t want my graphics (logos, text etc) to be distorted by a mesh geometry.
Problems I have:
– I cannot use Camera for Texture coordinates, because this type of texture mapping distorts my graphics according to geometry
– I cannot use Window for Texture coordinates. It ignores the mesh geometry, but it shrinks my graphics according to the Window proportions
– It’s really hard to position a texture using Mapping node coordinates, because I cannot choose a center of transformation. If I could scale and move the texture according to the center of my pack I would be happiest man in the word.

Thank you so much for your answers gentlemen!
To Martin: yes, I don’t want my texture to be distorted by geometry.
To Dwayne: thank you so much for this tip! It really helps to move and scale texture in 3d viewport!

For Omar and Grady:
I created a screeshot with example

Here Mona Lisa is my artwork texture, I don’t want it to be distorted by geometry. My project is a beauty pack for commerce purposes and brand managers don’t want to see distorted artwork, logos and etc. In my project the angle of view is specially selected, so front of my pack is facing camera view.