Keen Vent help please

I know there are a few posts on Keen Vents, but many go years back and I was getting Dizzy reading them all.

I just ordered some KEEN vents. I currently have a honeywell tstat. Do I need an ecobee tstat to get full functionality? I know ecobee are supported for Keen, but is that because of their Hub… I will be controlling the vents with Smarthings.

Does full functionality require custom handlers and apps?

Thank you for your assistance.