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The majority of failures are in the bottom seam, euro brace on the top is not going to help. There's some side separation, but minor cases compared to the bottom.
Separate note, plexiglass or acrylic does not bind well to glass.
That is something you will have to figure out. Most float valves are designed to be vertically placed through a hole. You may need to 3D print something, or drill your tanks (or a PVC wall if there is one) to make it work. But you want the float valve to be in a permanent place, as that will...