Hi,
- For the RODRET, I’ve had a lot of benefit from this blueprint:
IKEA RODRET Dimmer + SOMRIG Remotes - ZHA/Z2M - Control anything - Don’t try to pair a remote close to a IKEA bulb - it might pair directly, not via the coordinator and HA.
- Use the forum search.
There’s loads of information in this forum… - Zigbee buyer's guide
- Not many people know that... A random collection of Zigbee trivia
- Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
If this helps, 
this post!