How do us A Static Mesh with Navigation

Hello there, I am trying to use a static mesh I have as a part of my walk able landscape for my AI but I have no idea how to set it up for navigation. I haven’t had any success finding a tutorial either. I thought I would just be able to place it and then wet it’s surface to block all and it would be fine. I don’t want to use a landscape if I don’t have to. I’m working in VR and the high poly count of landscapes is too much.