I would like to seek advice from fellow forummers. If my unit is on 23rd floor but there is a small ledge after the balcony railing, is it recommended to fix grill anyway at balcony sliding door or not necessary? The ledge is approx 4 inches and it goes around the building. My unit and next door balcony is side by side. Do you think that it is possible someone can step on the ledge and climb over?