I know that the DCAMU's Pre-Flashpoint timeline was actually supposed to be the DCAU before they scraped that idea (which is good because that's stupid), but I really wish they had canonized the non-elseworlds based films as Pre-Flashpoint. They work really well together as a timeline for the most part.
Here's my thinking here:
- Superman/Batman: Public Enemies references Superman's funeral.
- Superman: Unbound continues Supergirl's story after Superman/Batman: Apocalypse.
- Superman vs The Elite takes place after Superman: Unbound despite releasing before because it references Brainiac. It uses the same theme from Superman: Doomsday. It has a monitor showing a scene from Justice League: Doom. Ace of The Royal Flush Gang also appears on one of the monitors with the same design.
This is how I'd personally list them.
188? - DC Showcase: Jonah Hex
1971 - DC Showcase: The Spectre
2000 -
Batman: Year One
2000 - DC Showcase: Catwoman
2007 -
Superman: Doomsday
2009 -
Wonder Woman
2009 -
Green Lantern: First Flight
2010 -
Justice League: Crisis on Two Earths
2010 - DC Showcase: Green Arrow
2010 - DC Showcase: Superman/Shazam! The Return Of Black Adam
2011 -
Green Lantern: Emerald Knights (Sinestro rejoins Green Lantern Corp, lol)
2011 -
Justice League: Doom
2012 -
Superman/Batman: Public Enemies
2012 -
Superman/Batman: Apocalypse
2013 -
Superman: Unbound
2014 -
Superman vs The Elite
2015 -
Batman: Under the Red Hood
2015 - DC Showcase: Death in the Family
2017 -
Justice League: The Flashpoint Paradox
Anyway, not actually canon. Maybe I'll cover every individual DCAOM film timeline one day, I don't know.