Cathedral 3D Mountain Flowers (original by drJacopo) and the one you linked (made by wSkeever) serve as a base. They have all the meshes and they tell the game where the flowers should be (original using plugin, wSkeever version using BOS). The problem is that they aren't fully precise, and you will end up with snowy flowers growing in the middle of pine or aspen forests. My mod acts as a patch that fixes these issues.
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Mountain Flowers - Base Object Swapper - Cathedral 3D Mountain Flowers - Reimagined Mountain Flowers - Skying Mountain Flowers at Skyrim Special Edition Nexus - Mods and Community
The problem is that they aren't fully precise, and you will end up with snowy flowers growing in the middle of pine or aspen forests. My mod acts as a patch that fixes these issues.