Even if you have multiple pieces of equipment, one of them failing can still be tank crash city. Like [MENTION=3628]BeanMachine[/MENTION] said above, the apex failed and left lights on. If you have a standalone doser it can fail and over dose. Once you start depending on electronics you run the risk of something failing and visiting tank crash city.
to @solitude247 another thing, if you go with BRS dosers they should be on the #4/8 plugs on your EB8... so if those are already being used by lower power devices you would need an EB4 or another EB8 (or an old cheap DC4).
I used drews dosers before and was happy with them, but now I am going to be dosing/auto water changing from my garage so I needed pumps that would be able to push further.