i've found kicks are safer when used against another kicker when you target the base leg thigh. i target the base leg because it means its easier to replant my leg. follow up options i've found include pulling guard to sweep of your choice or trying to hook under the armpit with your toe to counter a suplex. i personally prefer clinch knees if i'm going to strike. i don't know how to counter strong kicks reliably with out grabbing them that is. against week kicks i just take it to the body and work for a single leg.