We have a lo who has started walking. We have three stair gates in the house.
One on the bottom of the stairs - to stop the baby from climbing upstairs when our backs are turned
One on the top of the stairs - to stop the baby going down the stairs. This means baby can safely toddle around if I’m upstairs brushing my teeth or making beds or anything else.
One on the kitchen door - this is because my eldest crawled in once when I was cooking and burnt his hand on the oven door. The baby hates sitting in the high chair so when I’m cooking I can safely put him in the hallway with toys and I can keep an eye on him, but not have to worry about him toddling around the kitchen getting into everything.
It works well for us, but mil and fil keep making comments about it being like a prison. They proudly state how they never needed stair gates and how they are ugly things.