Do you need to read ALL the Mirror Universe short stories from the three Mirror Universe novels, or is reading The Sorrows Of Empires enough before you start Rise Like Lions?
I have read the DS9 Relaunch MU novels.
noted, I tried to provide all essential details in the text of Rise Like Lions
so that one can simply jump in and start reading.
That said, I made a great effort to incorporate and continue as many 24th-century story threads as possible from my peers' MU tales, in all three MU anthologies. I found it a bit daunting to reconcile and merge many previously unrelated story arcs from all the short stories, but in the end I think they knitted together fairly well.