Yes. Not sure lethal AI is working correctly right now, however, as it hasn't been updated since January and people are saying it crashes in the comments
Personally, for mods that make the game harder I run:
Combat Extender,
Combat Extender AI (crashes in at least the Duergar Gyrmforge fight against Nere),
Stronger Bosses,
Death March,
Additional Enemies,
Tactician Plus,
All of those work no problem together outside of Combat Extender AI, which has some battles in which it will crash. All of those mods seem to be being actively updated, whereas Enemies Enhanced and Lethal AI seem to have been abandoned/author taking a break