Hello @boelle I cant give a lot of support on setup at the moment but you might be interested in trying the demandshaper module for emoncms Emoncms Demand Shaper module which works in conjunction with the EmonESP firmware that can be uploaded to a WIFI relay unit GitHub - openenergymonitor/EmonESP: ESP8266 WIFI serial to emoncms link
It might not be precisely what you are after as its not integrated into emoncms dashboards and its more for scheduling devices based on day ahead forecasts for low cost electricity, low carbon power but it does allow for tuning on/off and settings timers from within emoncms - and is under active development.
The installation guide can be found here: GitHub - emoncms/demandshaper: Appliance, Smartplug, OpenEVSE demand scheduler: Find the best time to run household loads.
I think I saw that you are using a shared server for emoncms, I think this will make setting up things like the demandshaper module much more complicated if not impossible. These need both redis and mosquitto for MQTT and a standard emonSD type configuration.
Have you considered running your emoncms installation using a standard emonSD image on a raspberrypi? Probably cheaper than a shared server over time?