Bermuda Bed And Breakfast How Far Down In The Soil Should You Place Metal Edging Along Beds To Keep Bermuda Grass From Invading?

How far down in the soil should you place metal edging along beds to keep Bermuda grass from invading? - bermuda bed and breakfast

Few areas of the excavations in the bed and the grass that grows on the side of them, so I am concerned, all free to do this area of weeds and to keep invasive weeds. I will pour the pre-clearance, so I think with this piece of metal. And instead of it along the raised beds to keep in dark corners sreading the grass.

Is this the same place, where?

Thank you for your answers!