Cellz Non Slip Mat is a mat for placing in most places for holding your phones. It is stick on both sides and feels really weird. It is ideal for many places including cars. It currently sells for £2.97 with free shipping to the UK.
I stuck the mat on a kitchen unit vertically.
I then placed my iPad on it with no real issue and there it stayed for an hour. I then removed it, used the iPad again and placed it back. I could see the mat collecting dust and I imagine a wash under the tap will resolve that.
I have got to say I really like this product. It’s strangely sticky too.