Are you referring to DOWN-planers or SIDE-planers?...if SIDE-planer, then it depends on HOW the board is being used...is the board ON the line to the hook and will be in play w/the fish?...or is the board on a separate tow-line that snaps loose from the main line when the fish hits?...
If ON the line, then you shouldn't need the extra height as constant tension there...if board is on tow line, the line will droop when the boat turns and will need the height to stay outta the water...and you are right about not attaching to bimini top frame...if a good fish hits that, it could be a big problem...
If you need height, just stand the rod in the gunwale rod-holder...that should be plenty as the rod-tip is then 6' or so above the water...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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