Server Redundancy Architecture, License and Configuration

Hello Guys, 

I need your feedback and inputs regarding this Architecture.

We plan to have a PC/Laptop to work as Engineering Laptop (Development Station) and 2 Redundant Runtime Servers. as per below picture

I checked the catalog and this is the closet Architecture that I found that is near to what we need to do but I have some questions:
  • for servers, I see that we need a dongle for each server:
    • Is it possible to have it as a software license? 
    • What is the difference between CT109921 and CT109923?
    • If there is a separate engineering station, then can I have CT109923 for the engineering station and 2 of CT109921 for each Server?
    • what is the license CT101113? I don't know why there are CT109921/23 and CT101113 on the Server?
 
also, Is Customer First support included inside the License or it is additional cost?
Also, where Can I find good reference for Configuration Settings? 
 
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