Looks good. A couple (2 or 3 is plenty) of screws in the bottom (I think 1" stainless with a washer s/b fine) and a little adhesive (for me, a little automotive plastic adhesive instead of double sided tape - the tape sticks out too much for me) around the top edge.
yea, got to find some strong silicone adhesive and apply it around the corners. Reinforce it with some screws on the bottom.