Metal grate floor

just started trying to make a metal grate floor for a project im working on.
using the wireframe modifier just doesnt seem to work for the stuff im using it for.
So the idea is i want to be able to place a plane anywhere in my project (any shape, like L shaped or T shaped) and use geometry nodes to turn it into a metal grate floor as shown in the picture.

as you can see on the picture (done with wireframe mod) the grate is not evenly distrubted.

I tried using geometry nodes (see pic 2), but how do i get it so i can just model the plane in my project to the form i want and than add the geo nodes to the plane to get an even grate metal floor.

if someone could help me startout it would be great

thanks in advance…a geo nodes noob