Please help with haproxy

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Set up haproxy on pfsense But with some things so and not understood There are two horizon servers ts01.test.local and ts02.test.local which work on port 443 https (certificate) and added to the backend haproxy c health check-on Haproxy on pfs FRONT is configured with a public address with a TLS certificate. Now I have some questions about the theory of work on the side of haproxy backend with horizon servers that work on https:

1. Is it necessary to screw the backend to each server with its own certificate ?, and in what situations is it done?
   Problems:
   The thing is that if you are forced to connect to your horizons on horizon then everything works, but if through haproxy, then it does not work authentication, He must see his dns name on HTTP request hack Ipro can.