The stone should be smooth, not angular, and the volume should be larger than two handboards until it is qualified. Do you think your stone is qualified?
Because Feng Shui originated from fire, water and earth in Jin Mu, the most common five elements can play a role in the right place. Stone is a kind of soil, so don't worry too much.
As for whether it is misplaced, it depends on the whole plan, and it is not enough to rely solely on the direction. Because it always calculates where the squat posture is based on sitting on the door. If it is convenient, please add a supplementary question.