The article addresses the charging of cell phones, but I, as a former professional firefighter am very safety conscious when it comes to charging anything that will generate heat while charging.
I have found a solution that provides an inexpensive and practical way to ensure fire safety while charging things. I purchased a couple of inexpensive baker's wire cooling racks from the dollar store. My phone is not the worst offender for generating heat while charging. I have had the racks around for several years, having noted how much heat my LAPTOP was generating while charging. It left my desktop quite hot to the touch. I now place ALL my battery operated electronics ( laptop, phone, Ipad) on the wire racks to charge. the folding legs on the rack allows about a half inch of clearance from the desk surface for air to circulate under the device, dissipating the heat and cooling the back of the device. I have a rack that is large enough to accommodate my laptop, and when not in use for the laptop, it is large enough to accommodate the phone as well as my Ipad or Android tablet. The legs fold for storage and it fits neatly on edge in the file drawer of my desk when not in use.
LOL. Our dog is a chihuahua mix. She can't reach the racks where I have placed them on the upper level of my roll top desk. The rack is pretty much occupied by my Ipad and my phone in recent times. The Android based tablet is stored away along with the laptop. Probably will not use the laptop except when we camp in the trailer. It is easier to use with the keyboard and wireless mouse than the Ipad with the touch screen keyboard. I type 40+ words per minute on a keyboard, and find it quite tedious to text anything lengthy on the touch screen. I seldom text with my phone unless I am forced to.