In wall 120V to 5V USB adapter from hazard? - Hardware - Home

Hi, I mounted a tablet beside the light switch, thought might be a good idea getting a mini adapter hide in wall to power the tablet. The setup does look okay but now I worried about potential fire and safety hazard… Are those cheap AC-DC converter safe enough to be hidden inside the wall? Is it a good idea to wrap this adapter using electric tape? Thank you in advance for all the advice!

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