Use "object" output from "texture coordinates" node:
Then to tune the texture position and scale, you can use the vector "mapping" node.
Also turn the image boundings to "clip" if you don't want it to repeat over the plane surface.
Alternatively, you can use another object as position, scale and rotation, as indicated here.
A link to the documentation.
Uses an object as a source for coordinates. Often used with an empty,
this is an easy way to place a small image at a given point on
the object. This object can also be animated, to move a texture around
or through a surface.