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You should adjust you running levels in the upper containers and your sump to prevent floods.

On power out the water that drains to the sump should not flood. So you have to adjust the running water level low enough prevent the flood.

In the case of drain blockage you need to adjust both you upper container(s) levels and the sump levels so that the sump runs dry before the upper containers flood.

Not much help but basically you do have to adjust untill things work.

The lower you keep the upper container level, the more water can be pumped from the sump with a drain failure before floods. And the higher the sump water level can be. So there is a tie in between the two. I usually set the upper container at some astetic level say right at the bottom of the top trim line. Then adjust the sump level to prevent floods.

my .02
 

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Will this have an auto-restart if the power goes out?

Yes.
That is another thing you check for.

But even with an hob overflow that breaks siphon, you should adjust so that even in that case you don't get a flood. Again, the sump runs out of water before the upper container floods. I test for that by just forcing the siphon break/ drain blackage.

I also use the return pump or a powerhead to suck out any air in a hob design. To help prevent siphon breaks and reestablish siphon should siphon be lost.

I also make overflows from pvc pipes with a water trap design. So the overflow boxes are not necessary. But then ugly pipes are. :lol:

my .02
 
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