@DirectIRG - Best???
Best is what works in the specific situation.
I know that Rachio doesn’t recommend extenders.
I’m not affiliated with Rachio so don’t call into support and blame me if it doesn’t work. Post here and we’ll try to figure it out.
My personal installation has a D-Link DAP1330 network extender to reach my Rachio (yes, it worked on a Gen 2). I have it advertise a different SSID than the network it is extending. That way there is no confusion to what device I’m connecting to and no thrashing back and forth trying to connect to an access point that is too far away.
If more distance from the base WiFi is needed then I’ve recommended Powerline Ethernet that has WiFi broadcasting from the far side. Such as:
I’ve used this one: https://www.netgear.com/home/products/networking/powerline/PLW1000.aspx
with good results in a non-Rachio situation.
Hope this helps.
As always YMMV.
Welcome to the community.