Really weird 2Gbps subscriber still need to eat Skyworth.
I'm not even sure how TM marketing come out with this shit.

In a way 1Gbps user get a "downgrade" because they are no longer getting WiFi 7.
But at the same time that Skyworth WiFi 7 is just glorified WiFi 6.

With a single node FTTR, I can buy a BiDi SFP+ module and run 10Gbps.
After install, just unplug everything and use your own gear, hello 10Gbps.

I'm not sure but in your current setup, they should work as well.
Is all your CCTV on WiFi?
If yes, are they all on 5Ghz or 2.4Ghz?

Not sure if you can configure Long Guard Band and force RTS/CTS. This might help if your CCTV are at far end of your house, which is almost always the case.

You need to experiment and see. I suspect you are hitting the hidden node problem:
https://en.wikipedia.org/wiki/Hidden_node_problem

Problem with CCTV and IoT devices is they use multicast / broadcast instead of unicast which make your whole network extremely noisy

In enterprise/corporate network, we usually put CCTV in their own VLAN so it doesn't cause a broadcast storm to other devices

Lower end or basic routers lack storm control / QoS algorithm which causes congestion when you have a ton of IoT devices in the network