So the seabed is like the land (bed) in that it has hills, flats and slopes. In particular where it tends to meet the land.
A seamount also qualifies though as does a gradual change in depth.
If you are able to anchor with your anchor pulling “up the hill” provided by the slope of the seabed you’ll find you get a better set and more importantly a better reset.
I have used this to our advantage when we have known that the wind will come up during the night from a certain direction, making sure we set so that any reset pulls us “up hill”.