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Spoiler hight at the rear of a bug is a compromise between reducing lift and reducing drag. The higher the spoiler the better the it is at reducing lift, but the more drag it creats (caused by large turbulent area behind vehicle). If you lower the spoiler, the air flows further down the back of the bug, creating more lift, but the turbulent area behind the bug is reduced, reducing drag.
So, if you care more about lift reduction, go for a high wing. If you want lift reduction, but drag is also important to you, go for a lower wing.
My spoiler is level with the bottom of the window (it attaches to the rear vents). However it still reduces lift, but doesn't have a detectable effect on top speed.
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