Just me, but I charge my batteries in an area that is cool with decent airflow to the charger. The charger is on a ceramic plate and in the summer, I have a mini-fan to supply extra cooling. I have read that the cooler you can keep your batteries while charging, the longer they will last.
LiPo batteries should probably be put in a fireproof bag. These, not for vaping, I charge outside on a concrete slab with no chance of spreading a fire. Overcharging this type of battery can cause violent explosions. Want to see the results, just do a youtube search for lipo and fire.