this forum is the ultimate case compadibility whit the h100 but i was not able to find the zalman z11 plus but htere alot of good case http://www.overclock.net/t/1144409/h80-h80i-h100-h100i-case-compatibility-thread-page-1-for-full-listings
I have the Z11 plus and im pretty sure it will fit. mines got to 140mm fans on top and since the H100 has 2 120mm logic would say that yes itll fit. also i measured and there appears to be enough space but since i dont have an H100 to try it with i cant tell you for sure