Most likely, you will never need it. But if you do, you want it in a place you can grab it easily. On my Lund, I have mine mounted to the floor right under the throttle control. It is out of the way and an easy grab if needed
On my last 3 2190’s and in my Dad’s 2060 I mount them in the Starboard bow storage in the corner that butts up to the bait well. So I screw it to the rod locker wall. Nice out of the way and if I ever need it easy to get. I never liked under the dash for a few reasons one being I like storing tackle under the dash another being it takes less of a beating standing up right in the bow. My throwable and other safety gear is all there together.