Rotation without object going on top of other objects?

I'm sorry if the title was a little bit unclear, but what I am trying to do is CFrame and rotate and object, without the object moving elsewhere than the CFrame stated.

The CFrame: 7.55, 12.1, 0 and the rotation: 0, 0, 90

However, if I rotate it after I've CFramed it, it will go on top of all the other objects. And if I rotate before, the CFrame will reset the rotation.

Any suggestions?