Don't waste your time with the glue.
You should be able to lift the second row of tiles a little bit and get the top of a strip mesh under those and it should stay there just by letting the tiles down.
Then it goes over the lower course of tiles and over the edge of the spout. No leaves in spout.
Yes the downside of the mesh can be glued, etc, but in reality there is no reason to do so because you will still need to be able to have 'free access' to your spout to hose the dirt out.
All you need for the mesh going over the edge of the spout is maybe some sort of straight edge it can be attached to that can be lifted for cleaning the dirt out of the spout.
DL
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