Tech Armor Ballistic Glass
Tech Armor is another popular brand I've used on my own devices, and they have great screen protectors. The strengthened Ballistic glass offers 99.9% clarity similar to the glass installed on your LG G4, and has precisious cutouts for all the sensors, earpiece and others aspects of the front of the LG G4.
They promise a bubble-free no hassle install, and offer a lifetime warranty if your screen ever scratches or breaks. So if that event happens, they'll replace your Ballistic Glass with another one. It's also one of the cheapest on our list, being just $6.95.