di mirrors always pose a threat for our greys,personally i would remove the larger one,having it as a backdrop to your greys cage would have potential risks.The one over the fireplace if it was me i would leave, when you bring your grey home,show her from the start that the mirror is there, she may well be inclined to ignore it,if you have a playstand in place she will have a landing platform & hopefully wont land on the mirror.Just my personal view, i have 4 greys who although have their own room do come into the living room but ignore my mirror.