I'm waiting for the Dbrand Grip to come out. Looks like it offers ample impact protection and still shows off the phone's back.

As for tempered glass, OMOTON has treated me well. Their glass comes with all the required instructions and accessories. They have a bundle available with two tempered glass protectors and a clear case for a pretty good price on Amazon. I'll add a link when I have time to grab it.

Amazon Link (OMOTON tempered glass screen protectors and case combo): LG G6 / LG G6 Plus Screen Protector (2 Pack) & Case Combo, OMOTON [9H Hardness] [HD Clear] [Bubble Free] Tempered Glass Screen Protector for LG G6 / LG G6 Plus and [ Hard TPU Bumper] Case (Black) https://www.amazon.com/dp/B071QY4YGM/ref=cm_sw_r_cp_apa_xIH-zbB7B2H7K

Edit: Added link