Great fish finder btw. I just installed mine a few weeks ago. My solution was to use a heavy duty ram ball clamp mount and route the cables through conduit so I can move it around. On the 2015 TI the install was rather simple as hobie includes predrilled areas to route everything for this unit. Here's my setup, maybe the photos will help.
Folded down while not in use.
Mounted on aka.
Cables routed through front right side pouch
Used a lot of conduit line in order to move the unit around. Cables usually route under my seat and out to the aka.
I do a lot of jigging so I like to have the unit mounted far out on the back aka so my passenger can also see the screen. This boat / fishfinder has already proved to be a deadly combo. Yesterday alone I hooked into a nice 6 lb. brown and 6 lakers.
6 lb. football of a brown trout.
Hope that gives you some ideas / inspiration to get that unit mounted.