I need plants transferred. How can I safely place them?

A customer has a question and I hope we can get some opinions on it, thanks

The northern lights are young. 4 leaves. Both were started inside in soil. Grow room is complete with 2 5 gallon hydroponic pots . I need them transferred so they’ll reach full potential. How can I safely place them there? Stones in place. No nutrients, yet.
Since they’re young can I support they’re little selves in they’re original peat ( mounds) in which they’ve been??
I desperately want them to thrive and unless I move them they will not reach their potential.
I’m desperate.
I look forward to any and all help.
Thank You !!!