I cant put a drink in the drink holder as it hits my hips/thighs when I pedal. I would be afraid of the same thing if I put an FF in there. Also, I find it unnatural to look down for the FF.
This is how I did my installation. The FF can sit high or positioned low, and is very viewable due tot he forward positon. It adjusts well for best viewing angle and folds out of the way. Depending on the brand of FF, with a Garmin, I can remove everything and only have the ball bases left and the wire harness neatly tucked in the side pocket for surf landing.
The wire entry point is sealed with a blue systems cable clam. The TX is glued down with marine goop right behind the mast post. Battery is a 12v 4.5amp gel cell. I had a 10 cell AA battery set up before. Light, yes, but had to charge every week. Between that and charging the radio, I opted for the bigger batt.
RAM ball bases are very flexible. I opted for them thinking that if I sold the kayak, the next owner will like the flexibility of attaching whatever gadget he wants. The blue system cable clam can be re-sealed without the wires. It makes for a clean solution even after removal of the FF and its wire harness.