Spot on advice from those ^^^^^. No need to obsess, but it's a good idea to get them all consistent, and keep them tuned.
No need for fancy structures. But a peek with a true bar is sort of essential. No need for fancy flouro race wax, but having some basic hydro wax in the bases is good. And yeah, I think setting up a 3 degree bevel on them all makes sense.
I would bet dollars to donuts that the way they arrive out of the wrapper is not that consistent. Might not be totally consistent from ski to ski.
My son coaches slightly older kids, but young enough where he is very involved in equipment choices and setup. Every new pair gets a grind, gets the sidewalls pulled, the base and edge bevels set, and then some love with the wax iron and brushes. Unless they are team or Europa Cup stock coming right from the Euro race room....which yours are not.
He probably does this to 200 pairs a season. Some are Blizz.
Doing this has zero to do with any results. Has to do with enabling each kid to learn to work the ski better, see some progress in their skiing, start to make good consistent turns, and have some fun. He is also big on having the kids understand how this works, and take on some responsibility.
But "factory tune" is dependent on the day, who is running skis through what machines, how they have cured, where they get stored and how they get shipped....and a lot of other stuff. There is really no such thing, as Primoz said.
All fixed with one initial tune. And as
@ScotsSkier says, if they are working, and they look OK with a true bar and light, the bases are probably fine.
Awesome journey as the dad of racers! Have fun! Don't beat yourself up, but realize that some of this will help and make a difference. Pay somebody to set them up and then take on the rest. No super time consuming. Most actually enjoy it!