You can check the coordinates of a specific point of your field in the rayCloud view. Either you can select a pixel of the point cloud and check its coordinates on the right hand side as below:
Or you could create a Manual Tie Point (MTP) at a specific point and then check its computed positions (once you have Process > Reoptimize the project):
As for the slope, you could use polylines (https://support.pix4d.com/hc/en-us/articles/202560309
) to make measurements and deduce the slope from it, but there is no tool made to directly measure the slope.