2 wifi and 2 bt to the ac1200, not just 1, transmitters without an antenna connected can break when they try to transmit
your third wifi antenna goes to the cm5
mainboard wifi is for non raspi cm4/5 cores so you can leave that one unconnected
RPI TX on the HG adapter is if you want to transmit from the cm4 with raspi-tx. Because the CM5 GPIO changed a lot compared to the previous pi generations that no longer works so you should leave that one unconnected too
This YouTube video is a good starting point, itβs the early board, for your AC1200, I connected as follows
ant1 β AC2100 BT0
ant2 β AC2100 BT1
ant3 β AC2100 WiFi0
ant4 β AC2100 Wifi1
ant5 β CM4 Wifi
ant6 β GPS
ant7 β LoRa
side mounted β SDR, comes with a MHF4 to SMA cable
8 in total ClockworkPi AIO V2 Complete Walkthrough: Assembly and Configuration