If you have several RDP servers, you don't have to install Myrtille on each of them; you only have to configure them to be accessed by a Myrtille installation.
You can either do it manually (see notes and limitations below) or copy and import the Myrtille "RDPSetup.reg" file over the servers.
If you want to use Myrtille through HTTPS (https://yourserver/myrtille), you have to create a self-signed SSL certificate or import a valid one (server side). Then, in order to use secure websockets (WSS), export this certificate into the Myrtille "ssl" folder, with private key, name "PKCS12Cert.pfx" and set a password that match the one defined into the Myrtille "Web.Config" file ("myrtille" by default).
If not using Google Chrome (client side), see detailed comments regarding the security configuration into the Myrtille "Web.Config" file. You may have to add an exception for port 8431 (secure websockets) into your browser.
In case of issues, ensure the port 8431 is not blocked by your firewall (or proxy, reverse proxy, VPN, etc.).
Both the gateway and services have their own .NET config files; the gateway also uses XDT transform files to adapt the settings depending on the current solution configuration.
You may also play with the gateway "js/config.js" file settings to fine tune the configuration depending on your needs.