Re: cases?
Tudia makes some decent cases for the Razer phone. I picked up the Tudia slim-fit heavy duty one from Amazon for about $13. combine that with the Razer tempered glass screen cover, and it's some decent protection without adding any more heft to the phone. It adds some grip, and I've dropped it a couple of times, and the phone didn't even take a scratch.
It has all the correct port cutouts and button overlays (instead of having the whole bottom open, just the usb- c port is open, and there is a cutie for the power button/fingerprint scanner). Highly recommend.