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If your res isn't higher than the rest of the system, the high point will collect microbubbles over time. Make sure you can do something with those bubbles.
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The position of the res doesn't matter. It'll be no more or less effective if its at the top of the system or the bottom. Eventually any good res will drain out all air, and initially any very low flow velocity spots with no easy way for air to escape will gather air bubbles. But in the end if the res works, it'll get rid of your air.
Although putting it near the pump will certainly making priming a lot easier.