Q) Is this mod compatible with USLEEP and Morrowloot
Yes, BUT, not all the changes implemented by USLEEP and Morrowloot are implemented in ZIA. I recommend placing ZIA lower in your load order than USLEEP and Morrowloot to avoid these mods causing any changes to the artifacts you want improved by ZIA.
Q) Is this mod compatible with Unique Uniques?
Yes.
Q) Is this mod compatible with X mod?
A) I can't test this mod against everything, so I won't always know. Overall, this mod has good compatibility. It doesn't require SKSE or any other mods. It will run with Unique Uniques, Ordinator and Morrowloot (though you should place it after Morrowloot in your load order).
Generally, any mods that only change the mesh or textures of the artifacts will be compatible (except for those affecting the Gauldur Amulet). Compatible examples which I use include:
Spellbreaker Reborn
Capeless Nightingale
Improved closefaced helmets
If a mod edits .esp files (for example, if it changes stats or enchantments), then generally it won't be compatible. However, you can usually still have both mods installed, though only the mod lowest in your load order will appear to work.
Zim's Immersive Artifacts
Morrowloot Ultimate
mlu.esp
It will probably still need a patch, but ZIA after MLU does seem right. There is one provided on the MLU page for
ZIA_Complete Pack.esp
.Sorting will produce better results for ZIA patches.
ZAB.esp
,ZBB.esp
,ZBW.esp
,ZCH.esp
,ZCV.esp
,ZDB.esp
,ZEB.esp
,ZEM.esp
,ZIA_Ancient Pack.esp
,ZIA_Complete Pack.esp
,ZIA_Daedric Pack.esp
,ZKN.esp
,ZMB.esp
,ZMR.esp
,ZMS.esp
,ZNI.esp
,ZRA.esp
,ZSB.esp
,ZSH.esp
,ZSY.esp
,ZVD.esp
,ZWT.esp
.