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I mounted mine in the bikini hook. Cut and shaped with a plastic welder. Only down side is it's hard to see the display. But, I only change settings when I tow or set to stock for cold cold starts.
just make sure you sit in the seat during a sunny day and can see it where you want to put it. next to the steering wheel is a good spot, but I can't see mine where I put it unless i move to the left or right a little. Also, take future gauge additions into consideration. You might not want to mount it in a center location of open space in case you need that space later....keep it up tight to other switches, etc and leave as much open space for additional items as you can.
My DP tuner switch mount used to be around one of the gauges on my 3 gauge under dash pod. Just switched to a 4 gauge pillar mount and didn't really want the DP switch up there. Found that the gauge ring fits perfectly sandwiched between the base and phone specific mount on my proclip setup. Pic on phone shows the mount before I reinstalled the cradle onto the ball swivel. Works well, I'm very pleased with this setup.