Although it is not obvious, it turns out that precise leveling of the tripod/pier/mount is not all that important. Of course you want to have reasonable values here (there's little point in having your pier tilted way off vertical). However, any discrepancies are easily compensated for by the algorithms used in the N-point alignment process.
A level mount can facilitate polar alignment because adjustments are made left, right up and down instead of at slight angles. Do not worry about leveling the mount with great precision.
If you are doing only a 1-point alignment, you may find that setting the home position and leveling is more critical.