Lay out the installed system before picking a height
List the fiber or coax handoff, modem or ONT, router, switch, splitters, patch points, power modules, adapters, and cable loops. Draw the connected dimensions, not bare device dimensions. A compact switch that fits on paper can become unserviceable once front-facing patch cords, a rear power connector, and the path needed to remove it are included.
Treat power as an enclosure design constraint
Use only power modules, receptacles, and mounting methods permitted for the enclosure and installation. Do not bury ordinary power strips or unsupported adapters inside a wall. Map the upstream circuit and any backup-power requirement. When mains work, new receptacles, or code interpretation is involved, use a qualified electrician rather than improvising around the low-voltage cabinet.
Plastic helps radios but does not guarantee coverage
A wireless-transparent plastic door avoids the shielding effect of a steel cabinet, yet radios can still be compromised by wall location, wiring, power supplies, neighboring ductwork, and heat. Test Wi-Fi and smart-home coverage with the equipment in its final position and the door closed. Ceiling or room access points are usually easier to place for intentional coverage.
Budget for heat and passive airflow
Modems, routers, PoE switches, power supplies, and ONTs create continuous heat. Add their stated power draw, inspect the enclosure's ventilation design, and consider the wall's ambient conditions. A box that is tidy but hot can shorten equipment life or trigger throttling. High-power PoE and fan-cooled equipment often belong in an open, ventilated rack.
Design for the next service visit
Leave enough slack to swing out or remove equipment without unplugging unrelated circuits, while respecting bend radius. Label both cable ends, ports, power adapters, and upstream services. Photograph the finished layout and keep the module list nearby. Choose a larger enclosure when the smaller size only works by stacking devices or hiding connectors behind permanent hardware.