Z-wave is designed to be repeated by any device with constant power. So door locks won't act as repeaters, but switches, plugs, light sockets, etc. will.

The home-assist docs link to this blog post [1], which is a great walk through on some common pitfalls when building a zwave network.

1. https://drzwave.blog/2017/01/20/seven-habits-of-highly-effec...