We've covered this before.
If the airtrap is not at the highest point, and you have any kind of leak in the loop, the coolant will come out of the airtrap (assuming it's not sealed).
If the airtrap isn't at the highest point, air will accumulate at the top of the loop, when the pump is turned off, then be caught later when it's turned back on.
An airtrap also usually acts as a fill point, and it really works best when it's on top.
Consider adding a bleed point, at the bottom of the loop, to help making a system flush/refill much easier/quicker.
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