This page allows you to see the average starting point of a fielder against all hitters, in all situations. You may also select a position to zoom in.
For example, this link allows you to see the starting position of third basemen, in 2018, in all situations.
“Depth” is from home plate, in feet. “Angle” is defined as -45° being the 3B line, 0° being up the middle from home plate to center field, and +45° being the 1B line.
Read more about how a shift is defined here.