Stupid boat/hose clamp question

Went and got these today. Had to wait in line outside so I took them even though it says for Pex. Worked perfect. Replaced the zip tie also lol.
Now onto mounting the Cannon track.
How far back to the stern should I mount it? I will OCCASIONALLY have a downrigger mounted in the rear most part of the track. I may fish 2-3 times a year with the trigger. You can see that there is limited access to the gunnel. I can access it by opening the storage door, but its next to impossibleto get all the way back to the stern. Track is 36" long.
I will use support plates underneath as @dadsbee suggested.
Thanks
Steve

20210508_181748.jpg

20210508_180140.jpg

20210508_181320.jpg

20210508_181342.jpg