Step-in Electric Fence Posts
Ideal for portable fences, these posts come with their own pre-molded insulators. To keep them from tilting inward at corners and around gates, stabilize them with tent pegs. In the case of gates, you clearly don't want the tent peg's line to cross the gate. So put two other "gate approach" posts close to the gate posts, pound each tent peg into the ground right along the fence line, and attach the tent peg's line to the top of the nearest approach post.