The suction cup works best if you clean the surface, then apply the suction cup. If the surface is damp I think it has the potential to work a little better, but not sure on that one.
You can always add a tether to a mirror housing or strong magnet placed nearby.
I don't think it would stick to coroplast very well. Too much flex. I've never tried though.
I think the wifi has 2 purposes. So you can remotely see if you are in frame and I think you can save the video to the connecting device.
I have a SJ4000, the original knock off gopro. It works good enough. I paid like $50 for it used with some basic accessories. It accepts all gopro mounts.
The last time I used it was when I was assembling a harbor freight trailer. The file is saved on my laptop though and I can't find the charger. Otherwise I'd share it. It works pretty good for the price. I did buy a knockoff gopro before I bought the SJ and it wasn't that great.
Edit:
I'm 90% sure this was recorded with the SJ.
I am going to try this for a mount. I already bought the suction cup. It is works really well, but it has to be smooth, flat surface. For example, my fridge door has little dots/shapes and it wouldn't stick. The side of the fridge is completely smooth and my 65 lb dog couldn't pull it off.
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
1995 Chevy Astro RWD (current project)
1995 Mercury Tracer
2017 Kawasaki VersysX 300
2022 Corolla Hatchback 6MT
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