In Japan, apartment walls are "inviolable" and no nail hole is acceptable. This model uses mini stapler needles(#10) to fix objects on the drywall/plasterboard.
The original idea is from Kabebijin products. ( http://www.kabebijin.jp/ )
These models fit to iPad mini 4.
I uploaded normal version and divided version for small workarea printers. (10㎝ x 10cm)
I recommend to use stainless #10 needles, but it could be diffucult to buy them ( at low price ) in countries other than Japan.