As can be appreciated by the Ordinary Artisan, the top panel 30 can be customized to accommodate different sizes and different quantities of cables and connectors passing therethrough. For smaller cables and lesser quantities of cables, the top panel 30 can be customized by knocking out one or more panel sub-knockouts 38, thereby providing smaller openings 42 to accommodate cables passing therethrough. Likewise, the top panel 30 can be customized to provide larger openings 34 by knocking out one or more panel knockouts 32 so as to accommodate larger cables or higher quantities of cables passing therethrough. In each situation, the top panel 30 can be customized in a manner such that no more of the top panel 30 is removed than is necessary to accommodate the desired size or quantity of cables or connectors. Furthermore, because the panel knockouts 32 and panel sub-knockouts 38 are laser-cut into the top panel 30, they can be removed from the top panel 30 with relative ease during an installation process without the aid of tools. In a contemplated embodiment, the top panel 30 has eight potential panel sub-knockouts 38 for low cable capacity and four panel knockouts 32 for high cable capacity.