Need some helpful tips on installing cast letters onto an uneven rock wall. I do mainly vinyl work and wraps so I haven't done much of this but this is for my church so its more of a favor/donation of resources and time. I have installed on walls but no uneven like this will be. Obviously i will have the template but my main question is how do I keep the letters all at even debth? My thought is to use adjustable studded pads, is the correct way to go? Or do any of you have any other suggestions or tips it would be much appreciated.