Hey Rob,
The skimmer should not really matter where it is placed. Just make sure it is only an inch or so from the water surface if you are not going to run it in a sump right away. that way it can get more of the JUNK from the surface.
The overflow will be PRETTY safe. The reason I had 2 is for redundancy and to reduce noise. (you throttle one back a bit to keep the water level in the overflow high, and let the other one handle the excess) . If you do decide to keep going with the overflow, I would get another one (It does not have to be as big) just for peice of mind. Ill let you know if I do not end up using my other one.
Keith
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