I read that review, and "Brian" does have a point. Dealing with all the brackets and such is a pain, especially as your dexterity and balance degrade with age and disease.
2 years ago I wouldn't have had a problem with the brackets. Now it's a very different story for me.
"Brian" seems to have been talking about an Acurite 5n1 Pro. It does come with a mounting adapter you scan screw into a wooden rail or post, but it's not something you need to use. It's not hard to put the 5n1 on a 3/4" pole and tighten down two screws. My only complaint is that the screws are very small, and not fun to find if you drop them in the grass.
Atlas is a different story. It has one integrated knob that tightens on the pole with no tools. I easily mounted an Atlas on a pole while I was still having problems standing and limited use of my right arm and hand. You can't beat that.
Some of the complaints I've heard about the WS-2902A were the lack of additional sensors like Acurite has. I guess the WS2000 is a response to that, but Acurite already goes beyond temp/humidity sensors, and more types are coming.