If you are from SG, then it is much less likely that you will be under SS. They do discriminate against third-world countries and you rarely see people from first-world countries put under SS. As long as your travel history doesn't contain frequent travel to flagged countries, the number of countries you have been to shouldn't matter much.
someone in May AOR from Aussie seems to be under SS in Sydney CIO, not sure if low risk countries mean anything but usually high risk countries high probability of getting SS