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I am seeing some cheap GoPro cameras on Ebay.
I plan to do tuft testing with them.
My main question would be about the suction cup mount.
I have seen videos of these things mounted to almost everything from submarines, to rockets.

How do they work ?

Do you need a slick surface for it to get suction ?

I would be a bit nervous about the thing falling off the car .
Would they stick to Coroplast ?

Please post your experience with them.
Are there certain models I should avoid ?

I notice some have WiFi - what is that all abour ?
I just need the cheapest, basic setup that will show what the tufts are doing without falling off the car.

Anyone here have a GoPro alternative that you would recommend ?

Thanks !