How do I make a model's CFrame only affect the Y-axis orientation with CFrame.LookAt()?

I have a script for a tower defense game and the towers' attack functions use the CFrame.Lookat() functions to look at enemies, but I don't want it to look up/down, just left/right. So, I want the orientation's Y axis of the HumanoidRootPart to change but not the X axis. Here's my script (This is a module script):

function towerModule.Attack(tower, player)
	local stats = tower:WaitForChild("stats")
	local target = FindTarget(tower, info.Range.Value)
	
	if target and target:FindFirstChild("Humanoid") and target.Humanoid.Health > 0 then
		local hum = target.Humanoid
		
		animateTowerEvent:FireAllClients(tower, "Attack")
		
		local targetCFrame = CFrame.lookAt(tower.HumanoidRootPart.Position,target.HumanoidRootPart.Position) --Here, I just need to edit the local targetCFrame to only change the Y axis orientation, but I don't know how to.
		tower.HumanoidRootPart.BodyGyro.CFrame = targetCFrame

		local oldTargetHealth = hum.Health

		if stats.Damage.Value <= hum.Health then
			hum:TakeDamage(stats.Damage.Value)
		elseif stats.Damage.Value > hum.Health then
			hum.Health = 0
		end
		
		local newTargetHealth = hum.Health
		player.Stats.Money.Value += oldTargetHealth-newTargetHealth
		
		if hum.Health <= 0 then
			player.Stats.Kills.Value += 1
		end
		
		task.wait(stats.Cooldown.Value)
	end
	
	task.wait()
	
	if tower and tower.Parent then
		towerModule.Attack(tower, player)
	end
end