Technically you do not need the base leveled to do a two star alignment. However this may be impractical if the slope is too much as it will cause instability.
It is also highly improbable that the slope would be correct for a polar alignment even if the rocker base was suitably modified.
The best way to make a Go to Dob. perform satisfactorily is to get the base level and if there is any scale on the base set it so that 0 degrees points towards the north. In fact if you accurately level the base and enter the date/time and location accurately a one star alignment will be all you need to find most objects.
Barry
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