Yes you are going to have problems with the air being trapped in the rad if you are not careful - best way to avoid this is construct an airtrap at the highest point in your system.
Also I don't think it matters that much where the water comes in - you have a pump in the system so the water is being "forced circulated" anyway.
What IS most important though is the rad is in the path of the coldest air possible - which is why most people have it at the FRONT with the intake fans drawing air through it.
Hope this helps
~ Boli
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