[RedDevil]

I can adjust both the height and horizontal position of my lamps, relative to the housing. In the car I can adjust the whole unit height. That should be sufficient.

As the filament is placed lengthwise the depth should not be an issue, it should not be too sensitive in that direction.
If the depth is off (like when the rim of the mounting hole has a burr) it only is off by the same distance as the disturbance, while a height or sideways deviation is aggravated by the relative distance of the source to the rim compared to the rim width.

When you replace lamps you should always check whether the light pattern is correct or not; and when you experiment with LEDs or HIDs you must be prepared to ditch the whole project if you cannot get it right.

My car has projector lenses which gave a relatively weak beam with the original halogens and very little stray light; I noticed that other traffic seemed to overlook my car at night. I nearly got hit for no reason whatsoever, more than once.
The projector units in my car are the same as those one trim level up that have the HIDs preinstalled in the factory.
When I installed my cheap aftermarket HIDs I did not hit the road until I was satisfied they had a well distributed, non blinding beam pattern.
Then I drove it to my dealer who did a realignment to factory specs - for free.
They actually raised the beam height a little, I feel like dropping it a tiny bit again.

If I could not have gotten the alignment right I would have put the original halogens back in - plus LED DRLs (which was my backup plan for increased visibility).

The message of that test was:
We have put one HID in one lamp house and tested it, and it is bad. Don't buy HIDs.

My message would be:
If you put in a lamp of any type, make sure it is legal, non blinding, well aligned and lights up the road properly or switch back to the original.

I have a sealed H4 halogen lamp set for a car I don't own any more. Nobody touched the lamp since it came off the production line, yet the glass sits somewhat slanted, off center on the lamp foot.

Any lamp type can have a production fault or be knocked out of position on installment.
It is not just a HID or LED issue.
Always check the alignment!