Sideways position
Position yourself perpendicular to where the photographer will be so they can make sure you get both of your faces in the photo!
The Angled position
If the person getting proposed to has long hair, which is many many cases- I recommend a different variation of the sideways angle! In order to avoid hair hiding their faces when they look down, you will want to face them towards where the photographer will be with YOUR back will be towards the photographer.
The photographer will then see your position but just a little bit of your profile, but we will get a wonderful frontal face of their reaction!
Here is another example where we got a better shot of her face and a wonderful context !