When I'm in prone I shoot on a lot of very uneven surfaces. (rocks, dirt, large gravel, etc...) I use the Harris Swivel types in the 6"-9" heights. Keeping it low as possible gives you the most repeatable shots and the swivel bipod allows for any uneven surfaces you may encounter. Also, I always use a small shooting bag for the rear of the butt stock to rest on and to change elevation up or down.
Now, if you only going to shoot off a flat bench then the swivel type bipod isn't needed.
I tried the Atlas bipod on my 260 Rem when it was first built, but very quickly went back to a Harris as the Atlas doesn't pre-load to my liking and is way too slow and a PIA to deploy every time I move, which is a lot.
A good piece of glass is like a fine piece of ass. There is no known substitute known to man, and neither are cheap.