Ideas on how and where to mount on a 2017 Lowe Stinger 175. Would like it to be a clean and virtually unnoticeable install but it should be easy to get to.

Aluminum+heat+bass=not good

I wouldn't worry about mounting it. Given your boats layout I'd consider sticking it behind the seats at the helm. That way it's right by your livewell, so if you catch one you want to bump, you can drop the fish in the livewell while you take the time to wet the board like you should not only to cool it down, but to make sure it doesn't remove the slime coat on the fish. 

Thanks WI Guide. You got me thinking. There is an aluminum channel on the underside of the live well hatches. Welded in for additional support. I could rig something that would secure the rule within this channel and keep it from rattling around. It would then be easy to access, wet down, and keep out of the heat. Don't plan on using it a whole lot but it may come in handy. Thanks again.

Gator Grip makes mounting sleeves.  Might be less trouble, though I always like the DIY solutions.

 

https://www.gatorgrip.com/shop/listing/6

Velcro'd to the underside of a rear storage compartment lid was my solution...

Ya like WI Guide stated, I wouldn't mount it anywhere.  Just find a suitable location to store it that's out of the sun and easy to access when needed.

Under lid of a hatch or leave nearby.

You and I have almost the same boat. Mine is the 170 which has more upfront storage and no up front livewell. Could you make some aluminum straps to slide it in and attach them to the front of the console. I do not attach mine, but that is  where I leave mine while fishing and running. It has never moved while running.

I drop mine in my ice chest; cool, wet, ready to use!

I have mine under my live well lid. Most likely mounted like others. Used Teflon straps to hold in in place. Slip it in and out. 

 Sounds good Spanky that's what I'm looking at doing