Setting up Orbi backhaul

Hi all

I have just bought the triple pack Orbi as my current Wi-fi is struggling to cope with demand. I am looking for advice on the configuration of backhaul I have planned.
I had hoped to connect one satellite via Ethernet to the Orbi router, simply because I can, but the second satellite will be in an area where wiring to is difficult, my assumption is that communication and backhaul to this satellite will be via the dedicated 5 ghz Wi-fi only. Is mixing the connection types likely to cause any negative effect on the performance overall ?

Another question I have is with respect to the inclusion of an 8 port Netgear switch (unmanaged), this will be part of the wired part of the network, my assumption up to now was that I would connect the wired satellite direct to the Orbi router via Ethernet and hang the switch off the second RJ45 off the satellite, rather than wire the 8 port switch to the Orbi router and hang the satellite off one off the ports of the 8 port switch, is my first thought the best way round ?

The obvious alternative for the system would be all dedicated Wi-fi backhaul and have the Ethernet dedicated purely to the 8 port switch and simply wired direct back to the internet modem.

any advice or pointers would be greatfuly accepted,

PS Also I assume that there are no known issues with the Wi-fi backhaul and potential interference with Sky Q backhaul channel ?

thanks again in advance for any advice and sorry if the above is long winded 

Iain