If it's a true GPS, then they all come with suction cup mounts. In my 740 I mounted mine on the windshield. In my '85 Camaro I mount it using a smooth pad stuck under the dash pad and a smooth pad stuck on top of the dash in my '05 Magnum, because those cars have the windshield too far out. If you're using a smartphone with a GPS app, those are more difficult because the mounts I've seen are quite flimsy. Fiddling with those when they get knocked askew is a distraction and will likely attract attention from the gendarmerie. Yet all new cars now have large multi function touch screens in the middle of the dash that are presumably okay. Go figure.
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1992 745, >500k km (now gone, but not forgotten)

Keith,

While the previously expressed safety concerns are well-taken, I'm going to start by paying you the respect of assuming you're a responsible adult who follows the law and drives carefully and considerately - a description I think is likely to apply to most Brickboard users. I'm also going to assume you're looking for a safer alternative to picking up your doodad and looking at it to figure out where you're going or, God forbid, fumbling with a map while driving.

Here's what I have used successfully for navigation and receiving handsfree calls, mounted on one of the blank panels between the dash instruments and the radio. You have to insert a sticky magnetic panel inside your phone case which may not be compatible with wireless charging.

https://smile.amazon.com/gp/product/B0721D4NPP

Given your description of your height, you might find one of these even better, since it can adjust the viewing angle. I believe the mounting is similar. I bought one but haven't gotten around to installing it yet, so I can't vouch for it.

https://smile.amazon.com/gp/product/B07T2GBZR8

Either of these options puts your map in the same general area as your speedometer, fuel gauge, turn signal indicators, etc. If you really want to get it up high, there are a number of models that will attach to your window by suction, like this one, but I can't offer any insights except that they seem likely to obstruct your view of the road.

https://smile.amazon.com/Windshield-Universal-Dashboard-Suction-Compatible/dp/B06ZZWYQF7

Good luck!

As a person that had responded to auto accidents for 38 years, I suggest that your phone be mounted in the trunk or the rear cargo area of your wagon