Moving heads position

Is it possible to specify numerically the position of movingheads? I need to specify the exact opposite value of the position relative to the center for two movingheads.

Does your moving head fixture have a setting in its menu to specify “reverse” x and or y axis? Mine have this feature. Downside is less control so I don’t do that. I just have mine “pretty close” to opposite in some of my sequences.
Otherwise I guess you might move one in photon to a position, then look at the dmx monitor screen to check the numbers. Awkward, but could work.