The placements aren't concrete as the shorts contain no solid info as to exactly when they're taking place. What we know is that, since the shorts are framing narratives where Maz tells the stories of the individual FoD episodes, they must take place after the latest story contained in each Volume. As such, Volumes 1 and 2 must take place after the Force Awakens, and Volumes 3 and 4 must take place after the Last Jedi. Since Jedi picks up directly after Force Awakens and Maz is implied to be busy during the Last Jedi and not chilling by a lake as she is in Volume 1, we can therefore deduce all 4 volumes must take place in the year-long gap between The Last Jedi and the Rise of Skywalker. The Poe Dameron comic, Resistance Reborn, Allegiance and the early episodes of Resistance S2 all follow on pretty quickly from Jedi, so I picked the gap between Resistance 2x11 and 2x12 as that felt like enough time had passed for Maz to have picked up the stories, but wasn't so far through the timeline that she'd have reached the place we find her in for The Rise of Skywalker.
