All of my layout control electronics and terminal blocks are recessed along the front of the layout behind the facia. The only thing under the layout itself is wire, which terminates at one of those terminal blocks and turnout motors. This makes layout maintenance a lot easier.
If I do have to get under the layout for anything all of my power tools are battery powered, including the work light with adjustable head and hook.
Swapping batteries is relatively easy if you have a charging station set up.
Bob