The screenshot you provide shows that the viewmode is on “shader complexity and quads”,which is different from “shader complexity” that I used when I took the screenshot,this view mode take triangle edge overdraw into account.
For efficiency,this asset is mostly crafted for high end consol and pc,but from my developer experience it should run on low end and mobile too,just try not to place it too dense,and all asset have lod set up, you can turn up lod to reduce overdraw,maybe turn off dynamic shadow too.I suggest always test on you target platform to see the performance.