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The general consensus is you want to mount the red dot as far forward as possible. This is because the image produced by the red dot is an oblique display, therefore mounting a red dot closer to the eye will not lead to a larger sight field of view and will obstruct the peripheral FOV.
That being said, you are usually limited by the weapon system or balance issues. For example, on an AR-15 style gun it is usually mounted on the receiver where it meets the hand guard because the hand guards are known to shift or loose zero. On an AK, They usually don't mount it any farther forward then the rear sight due to mounting options or proximity to the gas system. Some people mount them farther back to keep weight off the front. So personal preference has some say.
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