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slot drain bunnings   Dan slot tab

If the grate was large enough to fit over the channel, perhaps you could have a tradesperson cut a thin slot between the channel and concrete to accept the lip

MEGAFLO GREEN SOCKED SLOTTED DRAIN PIPE Australian-made with recycled material Megaflo® Green is a wide and flat-shaped panel drainage system that provides 171 L x 171 W x 137mmH, 100mm internal channel depth, 20mm slot visible from the surface once installed; Manufactured from 100% recycled polymer

taco brothers saving christmas slot Slot Drain provides drainage solutions that are durable, sanitary, aesthetically appealing, easy to clean, load class rated, corrosion and temperature The only reason that you would put a drain under the garden bed is because water is not draining away I recommend using Vinidex 100mm x 20m Socked Slotted