A few fractions of an inch or a couple millimeters of movement will destroy or degrade satellite signals.
Make sure the pole is straight or plumb om all sides before pouring the concrete. A leaning mounting pole can be made to work for a single satellite, but the elevation will not be correct. A leaning mounting pole cannot be used for a motor without great headaches. Pay close and precise attention to the way the mounting pole is installed.

There is an android app that I use for dish alignment. You may want to try it as it has a talking signal meter.
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