A few years ago I was asked by a customer to come up with a mount for his 7" chart plotter that:
1- Was NOT one of those "gawd awful looking" NavPod boxes (his words not mine).
2- Could utilize the existing 1" Edson feet and 1" pedestal guard top plate.
3- Was symmetrical and not off to one side.
4- That looked professional, like it came from the factory.
5- Still provide a hand hold.
6- Make the plotter easily removable.
7- Not cost an arm and a leg.
8- Kept the plotter and cables mostly out of harms way.