These can be linked to other Family Graves in the area or can be added as additional photos to the individual graves. I typically will take a photo of the monument with the family name and link the other stones around it .
Yes - it is especially important to take a photo of the large surname stone, showing as many of the family member stones as possible. In some large plots, you may need to take views from different corners or sides. If the family member stones do not have the family/surname on them, be careful to link everyone back to the big stone.
This is one I did in the old country churchyard cemetery where my father's family/ancesters and neighbors are buried. The custom in the place is to have all the plots in a row, and not all the stones will have names on them. In several cases there is a marker for the couple and lots of little markers for unnamed infants.