I installed it through the HACS component.
No. That is only required to pair new entities to the hub
Yes. I can still access my blinds through HA, Automate Pulse2 app and RF remote. Though I’ve never tried using all three methods simultaneously. 
Initially I did have the ethernet cable connected but I reverted back to WiFi only because I found that it caused problems when trying to use the Automate Pulse2 app.