patrickisfrench
with an O11 dynamic, lian li case, where would be best mount location of a 240mm hybrid if i already am using the top mount for a 360aio for cpu. front? bottom? would tubes be top or bottom of rad if front mounted. also, is there room to mount a third 120mm above or below a 240mm rad on this case? or does the metal of the rad not make it possible?

Definitely front, ideally with tubes at bottom of rad as long as they are still above the level of the GPU block. If you have the 3 front fans as intake which then blow through the radiator and into the case, there should be no problem keeping all 3 fans there. Mount the rad on the upper 2 fans though.
 
edit: Oops sorry Avenger, didn't realize thread had moved to a new page when I was answering this. 
 
 

This may seem excessive, but I try to run the system offline before I mount the unit.  Or, tilt the case to bleed/purge any air bubbles from the pump/block.  Can't see it, but you can sometimes hear the air in the pump.  Similar precautions as flushing coolant fluids in a car.

Europe?