I use a Cumberland Crappie extendable mount for my Garmin 93sv unit, which sits about 12" high & can be extended up to over 20" high. Problem is, the maker of these got ill and had to stop making them (shortly after my purchase). The price at the time was $100 and I thought that was "high" until I looked around at the cost of other mfgr's products.
My Hook 7 is mounted on a short Ram Mount.

I don't know what "break the bank" means to you, but most mounting systems seem to start in the $200 range and go UP from there.