I made a desk top and routed out a 4.5" circle for a wireless charger to mount from underneath. It is about 1/8 or 3/32 thick in that area, which I'm worried about structurally. I was thinking about trying to fill it in a bit. Even thin plywood would probably add too much thickness to charge reliably, so I was thinking about just adding a 1/16" layer of wood glue in the bottom to firm things up a tad and make it sound less hollow. Any better ideas?