Hi ruilourosa! As I'm sure you are aware, the alignment you really need to check is between the lens mount and the negative stage. The alignment of the enlarger head to baseboard is much less important. I have one of these devices and the laser on mine is projected through a hole the is approx 4mm diameter. The size of this hole limits the resolution and will limit the usefulness of this device for checking the critical lens mount to negative stage alignment.
For what it is worth, the body and eyepiece adapter on mine are both turned "true", which I checked with V blocks and a dial gauge and the laser on mine is in alignment. Various astronomy websites carry a lot of commentary on these devices, both good and bad and it might be that there are different factories making the same thing. Apparently, a common fault is that some of them are poorly adjusted so the laser has to be aligned by the end user. The alignment of the laser is easy to check and should be adjustable via set screws. although these may not be readily accessible.
My one works well enough for what it was bought for and is an occasionally handy workshop tool. It could be a good starting point for an accurate enlarger alignment tool but, out of the box (and in my opinion), it doesn't quite make the grade.