What is orientation of IMU (LIS2DH12TR) chip xyz axis on DWM1000? I could not find this information anywhere. 
DWM1000 module doesn’t have any IMU or MCU - it has DW1000 chip and some components like 1.8V DCDC, crystal, decoupling etc.
Probably you mean DWM1001C module.
Below is the major components locations on the module (U4 is LIS2DH12TR):
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Sorry, I am talking about DWM1001 module. The figure you shared for DWM1001C, which component is IMU?
It’s U4 (LIS2DH12TR)