Is the holder itself going to be subject to spray from the tank or sump? If not then I'd just use some metal strapping. I don't know the name of the stuff but it's like the most standard thing you can get at any hardware store, it looks like tape but is metal, has holes along the centerline at 1cm (or thereabouts) intervals so you can screw it onto a wood surface and so on.
If it is subject to salt spray then I'd just use a large zap strap (you can get them in pretty mondo large sizes). For a 1' drop you may need to daisy-chain them but they'll work fine.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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