Does Cartography network to multiple displays?

[Yachtspecco]

My customer purchased new components a year ago which I installed and now he wishes to add additional functionality and new mfd's. The system installed last year included:
EV200 Autopilot
P70R control
type 1 hyd pump
E15023 Smart Controller
E7D MFD E62355-NAG
A66090 50/200khz bronze thru hull TD

He wants to add:
ES 97, ES98, Q24C Quantum Chirp Radar w/ data cable and possibly an AIS
Will the Navionics+ Cartography network to the ES9 series displays from the E7D or does each MFD require cartography installed? I presume the gps signals from the multiple MFD's will be disabled except for one to avoid system confusion. Therefore there will be a designated Master display, correct?
No software revisions have been downloaded since the install a year ago and I would need to check for updates needed to existing components to insure compatibility.
He desires the larger 9" displays for visual clarity and this will allow charts displayed full screen on one with radar on the second as well as overlay capability on either. The e7d would move to the seldom used inside steering station.
Does this system sound reasonable?