Facing Motor6D to a position

Im trying to make this turret face a enemys humanoidrootpart position without rotating the upper part its welded to with Motor6D. I have been trying to find other posts about this but couldnt find any similiar ones…
image
Also i dont want it to look downwards to the enemy

Any help is appreciated!

Use CFrame.lookAt

but it moves the other part too?
i want to use the Motor6D