A good way to go is to create a new youtube channel with some random gmail acc, the upload a video and follow monetizations process, this way you´ll have a new adsense account aproved instantly. Then ask for content monetization on that account and place the test ad in a blog with some traffic (it actually no matters how much as long as it complaint with adsense policies), you´ll get the content aproval soon.
I like this way cause it speeds up a little bit the whole aprobal process, and the cool thing is you can use the same blog over and over again to aprove different adsense accs.
Post Office box may be also a solution but probably you meant that with pin. @landalas that’s also a nice method, I will try this when it will be actual.
Thank you guys.