Unless I was bow-hunting, I probably would not choose to use decoys in the woods... (Unless I was hunting a meadow, or a large clearing)...
If a bird comes to the call in the woods, I have found that they will continue forward motion until they see that hen... Once they see the hen, they will often start strutting and try to draw her in... And, if I have to move, I like to do so quickly and quietly without being busted (by trying to set up decoys).
If for whatever reason I did decide to use a decoy in a wooded area, I would have the decoys a bit closer (no further than 15 yards) and I would have them on my left side (as a right-handed shooter), as it is far easier to swing left than right. If you have a hen and jake, the toms will generally approach the jake first, so I put the jake behind the hen, where I want to take the shot.