with connections of your 3 cables looks to be correct.
modem to Router are in the right ports.
what speed is your internet if on you 1GB+ you may want to use Cat6+ cables.
cat6 and cat6+ will give u what 1-10GB connection. i have been told any flat cable cannot be cat6+ and it make sense but never looked in to this.
my cable in the walls are cat7 with cat8 connections on them and from the wall to any device are cat8 cables this is over kill as this gives me 40Gb connection on the 10m run and 10Gb on any run bigger then 10m(i don't think any are over 10). also the router i believe is capped at 1gb. i just wont want to rip up the wall again. so kinda future proofing a bit. and i know in my area i can get 2GB internet connection now with city fibre.
My setup with cables is
Modem > XR1000 to XR500(AP), and 2x ex770,
XR500(AP) to PS5, TV, Sonos,
1x XR500 is to my Sons PS4,
Even tho most of these devices show as offline they are really online and connected to one of the AP. just a shame they show offline here. but in the Phone APP and table view u can see the IP address and in network u can see devices working as normal.