If the vehicle & the LPG system is maintained correctly & the LPG system is installed correctly then it is safe. LPG has been around for many decades.
Any fuel has the potential to become a fireball, Even petrol cars have caught fire after accidents.
There are many options available for a 2 DIN music system for Hyundai EON in the market. You can check with a local car accessory shop to know about the options in detail. Also, you can check out some options on our online shopping portal. Please find a link below to check out the music systems http://shop.cardekho.com/car-accessories/music-systems.html