A plug and play system is permitted to feed up to 600W into the grid in Switzerland. This means that the 600W version is suitable for Switzerland. There is a 600W and an 800W version of EcoFlow.
For the Swiss plug, Galaxus is subsequently told to send a fixed adapter for the Swiss plug. This is mandatory in Switzerland. They will send this adapter free of charge.
Good luck :)

I bought this one.
EcoFlow PowerStream Microinverter
I don't remember if it came with a Swiss plug, but that will probably be the smallest problem. The lack of sun is almost the bigger problem for me ;-)

Are also only Schuko because they come from DE