If you could post some photos, it might be easier to understand your concern. Otherwise, I'm not sure I understand your questions.
There are lots of options to avoid siphoning out the tank in a power failure. In fact, I would NOT want to rely on a siphon break hole because they can easily get plugged up.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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