An update. While @Cyknight advised against zwave locks, I was already committed with owning two of the them (Obsidian) and the C4 zwave module. I was able to add in an Aeotec Range Extender 6 (the Range Extender 7 did not work for me) to the zwave mesh, greatly improving the reach and making reliable connections to my farthest lock. Currently working great. One note on adding the Range Extender 6: it requires a two press button action to add it with the right security protocol. We'll see how it goes in the long run.