You can go to SteamVR's settings window then in the Startup/Shutdown tab, pick the "Manage Overlays" option and turn on KinectToVR.
Next time you start SteamVR, K2EX will launch once VR is fully started (When you are in VR with the concentric circles on the ground)
Alongside autostarting with SteamVR, you can have K2EX automatically spawn your trackers when it's launched. When enabled, the trackers will spawn 7 seconds after the app has started, and will only spawn if the SteamVR driver is working.