Setting up ~25 cameras over 3 sites

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New to the forum.  Hi everyone.  Reaching out to see if anyone can point me in the right direction.  

Scenario is I have 3 different sites (A,B, and C).  Each site has high speed Internet but are over 100+ miles away from each other (no line of site or fiber)

Site A - 20 cameras

Site B - 3 cameras

Site C - 4 cameras

 

I have a Monitor (Display 1) in building X

[To view 15 cameras from Site A]

 

I have Monitor (Display 2) in building Z

[To view  5 cameras from Site A, 3 cameras from Site B, and 4 cameras from Site C]

 

buildings X and Z are connected over Ethernet. Can anyone out there help point me to which software to best handle a setup like this?  So many options and I like to understand best practices.  Can one NVR handle this or is better have to multiple NVRs?  If I wanted to add additional screens (monitor, HDTV, etc.)  i’d like to have that option for viewing the cameras in multiple places easily.

Thanks for any input out there !