I covered half the holes in my OHF trays.
About half of my media would be submerged while the other half not. The media I have placed at the base tray is also submerged.
In general OHF base tray would be touching the 2 sides of the tank. See if you could move the base support to touch the back edge of tank too. This way you have 3 sides to share the weight, not to mention centre bracing if your tank has it.
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