And welcome to the forum. The D7000 will work with the normal CP-2 Plate. You have to take off the protecting plastic shield of the back monitor and replace it with one of those protecting glasses when they are available. Then you have to use the top plate of CP-2 with the long nose to the back of the camera body. At the moment I mounted the base plate with its short side to the lens, which serves for most fisheye lenses. Have a look: the white mark divides the base plate into 2/3 to 1/3, so one side is longer and one side is shorter. I placed the shorter side to the lens.
May be you have the old Cp, this is one peace without the anti rotation top plate. You can use it as well. To send a picture you have to use the Go Advanced Tab, and you can upload your picture by using "add file" and upload it.
yes you can. Think of buying 2 of them, in case you use lenses which have to go to the far ends of the upper rail. So you do not have to change the CP-2 top plate position to the base plate. Gives you 90° fixed position once fixed exactly.
When you only work with one lens, one plate is ok.
On D3 my 50mm asks 38 on NN5, so the 1/3 side of the base plate has to be set to the front. Other lenses ask 136, so the short side has to be set to the other end of the rail, so long side to the lens. But you are ok with one.