we have a simlar set up, but less steep.
I cut a piece of 1/2" plywood about 4" wide x the height of the metal railing. I drilled 6 holes and put heavy duty wire ties to anchor it on the rail.
screw the the slide type child gate hinges to the plywood, put the seat cups on the wall (wood rail) side, and that should hold em.
This is not the prettiest set up, but it's kept my two boys from tumbling for 5yrs now.
Good luck
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