Yep, I just stick it into the top vent about 2". It came with a clip, and I just clip it to the tab on the vent.
Lid temps can vary compared to the different grates, but that depends on if you are using water in the pan, sand, or the piedmont, or if you use a Guru or Stoker.
Bottom line also, take the lid off as few times as possible. That helps keeps temps balanced throughout the WSM.
I should have also mentioned that instead of using remote therms, I use a thermapen instant read thermo to check temps when I think they are getting close to being done.