Never leave shoes outside in Australia. - Also if I have left work gloves or overalls in the shed I always do the Mexican hat dance on top of them before wearing. Have saved myself 2 redback bites doing so.
Under every pot plant rim there will be one or two redbacks so you have to be careful moving them - under every piece of garden furniture as well and you can’t leave kids toys outside or they will end up with them in them as well. - still they don’t come in the house so as long as you are careful they are alright.
Question: Are these things all over Australia? Or are there parts of Australia where you don’t have to worry so much about creepy-crawlies zapping you?