Fake Rock for Outdoor Garden Landscape Décor - Durable Faux Rock - 11.5 x 7.5 x 5.5 Inches

One of those decorative rocks that people use to cover garden plumbing:https://www.amazon.com/Fake-Rock-Garden-Landscape-D%C3%A9cor/dp/B0DFT5CT2QJust cut out the back with a multi-tool.