I would just mention that they don't specifically list compatibility with ZR modules in their tech specs.
Of course, to follow that up, I would have to ask why you need 80 kilometer range for your NIC. Copper Twinax DAC cables are good up to 15 meters (49.2 feet). Are your NIC's really 49 miles away from your switches, that you need ZR modules?
totally agree, you need sure the received power is below the overloadIf you did use this, you'd need a 15dBm attenuator as its TX power will come close to frying the other side if it's too close, if not certainly overload it.
http://www.cisco.com/c/en/us/produc...transceiver-modules/data_sheet_c78-455693.pdf