To fix a small shelf to a plastic (?) conservatory frame. Swmbo wants something like a 100mm deep shelf running around the walls of her conservatory. About 600mm up from the ground. Putting something like this on legs might look very strange.
I understand the plastic frame has a steel inner frame. Would fixing to this be necessary?
She only wants to set small pot plants and small ornaments on it. Nothing very heavy.
Many thanks for any and all help