Per Design Tool, 3 Cameras Would Be Enough To Cover The Entire Hallway, But Something Feels Wrong

According to IP video design tool, I should be able to get great view over the lenght of a 250ft hallway (besides one sorta blind spot by one camera), using only 3 cameras. However, something feels wrong to me.

I have attached a screenshot of layout as well as the camera settings.

Thank you

Layout

specs

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