Sorry, here are the pictures:

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These trees all have very straight, cylindrical uninteresting trunks. Putting them in the ground is a good idea but wait until late winter or early spring to do it. Then I would cut them off about 3 inches above the roots and plant them at an angle so they will regrow with some movement to the trunk.

Many people will have many suggestions. Here are mine.
If you're going to put them in the ground, put them over a tile. Seems this method would go a long ways to avoid fighting downward roots later.
Don't worry about where they were cut already. This will not be part of the final tree and unless it is a source of tearing or rot, leave them.
Planting at an angle will definitely assist with movement, I however wouldn't cut yet. Every cut slows the plant down so you might get further faster to let grow for a year or two before the initial chop.
Since these are cultivars they are probably grafted. Someone correct me if I'm wrong. Just watch for that if you do choose to cut them low.

That was my thought as well, re: grafting.

It looks as though these grafts are more than 3 inches above the roots,
and so I would not recommend cutting these trees that low...lest the
new growth emerge solely from the root-stock.

I like Sfhellwig's suggestion:
1. Grow it for a while on a tile....

Also, you might consider air-layering the top of one of these trees.

Josh