Waterproof speakers are generally easy to install, though some are easier than others. Most in-ceiling speakers are designed to attach to plasterboard. Before buying speakers, it is a good idea to ensure that you will have enough space to install them. Make sure to check the depth of the space behind the plasterboard as well as the width between the beams, otherwise you may find that you have cut a hole in your ceiling or wall, but the speakers don't fit in. Make sure that you can install the cable to the speakers neatly, ideally, you can run it through the ceiling cavity, though this can sometimes be difficult if there ere obstructions. An ideal time to run the cable is whilst renovations are taking place, whilst you can access the cavity easily. Don't forget, you can use the speaker holes to aid with cable routing if they are positioned strategically. For further information you can try this out.