I never tested it with Unique Landscapes. UL is a large mod with a lot a modified exterior cells so there's a good chance for my mod to conflict with UL. By the way you can play with this mod and UL activated. Just place the mod's esp after UL's esp. It's harmless until you save your game. If there's a conflict you won't be able to see dungeon entrance or some props will be floating in the air (or underground) that's all.
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Hope it helps