These are the probe points. Because you are only going to probe in 2 points you will simply delete the {190,190} so you are only probing 2 points.

Then the 2 sets of numbers within the 2 remaining probe points are X and Y coordinates.

Assuming that your printer raises and lowers the X axis like everybody else the first number in both sets should be low and high at the edges of the bed but on the bed.

The second number should be set to half of Y's dimension this way you are probing the 2 sides of the center of the bed.

So like if you had an i3 with a 200x200 bed your numbers to probe might be {{10,100}, {190,100}} .

This will keep the bed fixed at half of Y and probe both sides of X or at each Z stepper motor.