Also worth specifying is the ability to memorialize multiple dwarves per slab, especially if they all died in the same war / siege / megabeast rampage / plague / etc. It would probably have to be a much nicer memorial than most other basic slabs, but better that than having to erect 30 of the damn things.
It might have to be a constantly maintained thing however if its a ongoing conflict, connecting to a particular event and updating itself with re-requesting that a engraver comes and updates it until it runs out of room (say 20-30 name spaces at player discretion)
A entire squads history of losing their members, with a dedicated squadron cenotaph.
(https://www.warmemorialsonline.org.uk/public/img/141936/WW1%204.JPG?v=5c1da1633e79f)