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For something which is always going to have a load of through holes in it, I'd put them on the same sketch as the extrusion. That way, you have one sketch to edit if you change the design, and if you're a tart you can lay out the holes parametrically in relation to the plan, if that's going to be relevant in the case of design changes.
my design consultant is still in bed, so: Fusion 360 - if I want to create a load of holes in a flat 2d shape, do I need to extrude it first, then create another sketch on that face and extrude the holes back?