Silly but effective
I try to grow tomatoes every year on our patio, but we border an undeveloped field... and the bugs/critters/birds have a great time, I've never gotten a single tomato! This year I bought one of those collapsible mesh laundry baskets, inverted it and fastened it to the edge of the pot ( which curls under) on 4 sides with those spring-loaded paper fasteners. It's working, we're getting tomatoes! Yay! I did have to trim the plant back when it reached the top, could probably cut the top off and piggy back another mesh.