Align to bottom

here you go

var doc = app.activeDocument;
var sel = doc.selection;
var reference;

// Find the object in the "Cameron Direito" layer
for (var i = 0; i < sel.length; i++) {
    if (sel[i].layer.name == "Cameron Direito") {
        reference = sel[i];
        break;
    }
}

// Set the position of the other objects based on the object in the "Cameron Direito" layer
for (var i = 0; i < sel.length; i++) {
    if (sel[i] != reference) {
        sel[i].left = reference.left + (reference.width - sel[i].width) / 2;
        sel[i].top = reference.top - reference.height + sel[i].height;
    }
}