Daisy chain two X6S (EX8000) wifi extenders

I am wishing to daisy chain two EX8000 extenders. I am hoping to use the "mesh" features that this model seems to have. There seems to be a backchannel on the extender. Orbi type features.

Does this back channel also get utilized by the second daisy chained extender #2 to the first extender #1?

Also, could i daisy chain another model of Netgear extender to the EX8000? I have a EX6200 (ac1200) unit that i would like to try to connect to the EX8000.

I also cannot find any documentation on how to do this either.

Thanks.