Plastic and acrylic dimensional signs are very easy to mount. Although they come with mounting hardware, in many cases, it really isn’t required. Simple double-sided tapes will suffice. They also come with a guide pattern so that your letters can be evenly spaced. As for outdoor surfaces like wood and brick, the only additional step is to drill holes into the guide.
So don’t think twice. Just pick the right sign company and tell them what you need!