we will prepare your room at free of charge(without any fee, or deductible)
Therefore you can save up to $6000 during the 12 months training period
In case you live at other property at your own cost, the benefit above will not be provided.

혹은

we will prepare your room at free of charge, that will be normally $450 per month, but we will deduct only $200 from your salary per month. In case you live at other property at your own cost, the benefit above will not be provided.

숙소나 차량 제공이 당연히 저렴한 값이라는걸 알지만(2bed room에 4-8명 살 듯하나..)
원치 않을 경우에 돈으로 줄 수 없다는 것이 미국 노동법 상으로 합법인가요?

합법