This is just seriously brilliant. Sugru, who make a rubbery adhesive have instructions for how to make a custom tablet mount just using three blobs of Sugru and, yes, you can take the tablet out and put it back whenever you want. I mean, seriously brilliant. 
https://sugru.com/home-diy/how-to-make-an-ipad-wall-mount
And, it comes in different colors including black and white.
I was first introduced to this product for use sticking the Naran Microbots to various devices. I’ve only had mine up for two months, so I can’t speak to how well it lasts longterm, but it molds and holds very well so far.
https://www.amazon.com/gp/product/B007VXJM58/
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