I like to keep my car clean, both inside and out. This is where the problem lies with this dashboard mount as it will not provide any purchase on anything that has the slightest bit of wax on it.
But I tried, and put it on the dashboard and it just slides around, even without the weight of anything attached to it.
I often recommend products that I have reviewed, but not this one.
Save your money and, I'm sorry to say, buy something which sticks tot he windscreen in instead (OK, I know it looks naff, but I can't think of a better solution).