Hi there, it might sound silly but we have a few overturned flowerpots, with a stone placed under the rim to lift them up a bit, scattered around our garden. We check them every few days for snails. They like crawling inside. Grapefruit and orange halves work too. We also try watering our garden in the morning instead of the evening. Snails and slugs like moist conditions so by watering in the morning it gives the surface soil time to dry out by the evening when snails are most active.