Hi Marcel, 

What you're looking to do may be possible, but I'm not sure if it's something that has been tested. The configuration in our Failover documentation is the only tested and supported configuration. On the licensing end, only one SmarterTrack installation may be activated with the license key at a time, creating an active/passive relationship between the primary and standby installations. This may be what prevents your suggested setup, as you won't be able to use one license key to keep both installations activated indefinitely. 

(The licensing information is stored in the license.json file. The default file path is c:\Program Files (x86)\SmarterTools\SmarterTrack\MRS\App_Data\Config\license.json.)