So if I understand it correctly i would need 2 servers in the DMZ?
one for iOS extender and one for the Exchange extender and i assume that i can run Android agents to one of the two since there is a relay one them both.
The Exchange extender does not need to be in DMZ as long as it can communicate with the MS Exchange Server because extender will not interact with devices directly.
The Mgmt Extender for Exchange is optional (many people don’t want to mess with their exchange server and so they only use the Android/iOS approach). If you do install it, as Dawson mentions, you likely do NOT what the Mgmt Extender for Exchange in the DMZ since there is no good reason to put it there.
The Mgmt Extender for Apple iOS is typically deployed in the DMZ (although it is not strictly required) because the devices are so rarely connected on the internal LAN.
I think i have been reading all the documentation, but the fact that the exchange extender, did not communicate with the devices, was not a fact I noticed.