re: General security camera discussion (was "Unifi Protect security cameras")

So over the weekend I did some research and got myself into spending mode

My father has told me many times that I have more money than sense...

My current system-
AT&T Gigabit Internet
Arris BGW 210 Modem - set to Bridge Mode
Google Wifi Gen 1 Router and 3 access points
LTS Camera NVR
4 LTS dome cameras POE


I started by wanting the Ubiquiti Cloud Key Plus in order to upgrade my current camera system. Turns out it will only work with Ubiquiti cameras. I say that's no problem, I could use better cameras anyway. So now I'm looking at the CK+ and 4 cameras.
I've been wanting to upgrade my wifi from the original Google mesh pucks. So of course I see Ubiquiti's ceiling mount access points. Well if I'm going with that ecosystem, I need more than the CK+ so now I am looking at the Dream Machine Professional Gateway.

In my head my system will now work like this:
Cat 6 cable from AT&T modem to Dream Machine.
PoE Switch connected to Dream Machine
Ubiquiti Cameras and Access Points wired to switch.

Is this correct? Will I need to do anything to configure my AT&T modem to work with the Dream Machine Gateway?
Essentially the Gateway will become my router correct?