I have two NVRs at my house and the MeShare see both, just fine. I have a four camera with all four cameras in use and I have an 8 camera with only two cameras in use at this time.
The 8 camera NVR sees the four cameras of the first system as they’re part of the 8 cameras. So be careful when you setup your motion alerts otherwise, you’ll get double warnings and get double recordings.
The user.zmodo.com website also sees both.