OmniMount Tria Single-Shelf Wall System. Tria 1 is a 1-shelf do-it-yourself solution that allows you to neatly organize components right under your flat panel without the need to run the connections through your wall. Tria 1 is designed with covers that easily snap on to the spine to route and hide wires. The Tria Series wall shelf systems offer hassle-free shelving and cable management solutions suitable for any environment and can be used with or without a flat panel. User-friendly features like adjustable shelves and paintable, trimmable covers make them customizable for any application.