jack stand help

hi, i just get a pair of jack stand, i’ve use the jack to raise my car and trying to use the jack stand to hold the position, but i found the jack is too big(the gap is too wide, it’s 3 tons jack)and wont’ fit in the black piece of metal. it’s holding on the rocket panel instead. i’m wondering is it gonna damage the chassis? if so, what i can do to prevent this problem, i heard ppl put it in the cross memeber, where is it located, is it the beam that located in the middle of the engine bay? thank you for the help