No, there is nothing for you to install – no panels, no devices, and no technician visits from UpGrid. You sign up online and we take care of the rest.
The one technical requirement is a smart meter at your connection point. Your grid operator installs it, and most Swiss households are getting one anyway as part of the national rollout. If you do not have one yet, your grid operator will arrange the installation, which can add a little to the lead time.
For more on buying electricity through UpGrid, see upgrid.ch/de/buy-energy.