I am considering a fail safe because, even if I breed, all my animals will be pets. Breeding would just be a side thing for fun. I want BELs and jigsaws, and happen to adore the morphs that make them just as much. I wouldn't want to take the risk of anything happening to them. I think the cost of a fail safe would be worth it just for peace of mind.
On a side note, how would probe placement work in a custom PVC like a Boaphile? The heat isn't directly exposed and is different for each unit. Do you need a probe for each cage? :/