I asked in the village, and people seem to use gardening textile to protect vegetables. I just wonder if this doesn't protect slugs from predators. Right now, slugs are not awake, so in the early spring, this could be a solution. Rhubarb leaves are just coming out right now.
Maybe I need to have some patience. A magpie just buit a nest near the garden, maybe wildlife has to adapt itself to the new situation. I moved in only 2 years ago, and the former owner seems to have used chemicals when gardening.
The old CD method would be very good to protect cherries, but I don't know about salads. I never tried myself, I don't know if it would scare the magpie which would be a bad news in this context.