Dretal Bumper Clear Case
If you're not going to use any Moto Mods, you might as well take advantage of some more cases. One being the Dretal Slim and Clear bumper case. The idea here is you'll get a durable case that's clear to show off the good looks of the Moto Z3 phone.
This case has soft impact resistant TPU material on the sides, with a hard (and clear) polycarbonate plastic on the back. Giving you the best of both worlds. It can protect the phone from drops while saving the screen and camera at the same time. It's almost like a clear shell bumper case.
You'll get precise cutouts for the side-mounted fingerprint scanner, charging port, and everything else. Try it out.