Ubiquiti UXG-Max Deployment Plan with Xfinity XB8 (Bridge Mode Migration)

Please, I would like to have opinion from this community if my approach to swap the XB8 Xfinity Gateway to the UXG-Max is correct and running low risks of getting in trouble, here is the process that I am working on:

Current Setup:

1 ISP: Xfinity

2 Modem/Router: XB8 (router + DHCP + Advanced Security)

3 LAN subnet: 10.0.0.x

4 Controller: UniFi CloudKey Gen2 Plus

5 Switches: USW Flex 2.5G 8 + additional UniFi switches

6 NAS: UniFi UNAS 2 (2.5GbE)

Goal:

1 UXG-Max as primary router/firewall

2 XB8 in bridge mode

3 Keep same subnet (10.0.0.x)

4 Minimal downtime + rollback plan

Deployment Plan:

1 Install UXG via LAN only

2 Adopt in UniFi

3 Configure LAN: 10.0.0.1

4 Enable DHCP and security features

Cutover Steps:

1 Enable DHCP on UXG

2 Enable bridge mode on XB8

3 Wait 1–2 minutes

4 Connect XB8 2.5GbE → UXG WAN

Expected Outcome:

1 UXG becomes router

2 Minimal disruption

3 Same subnet maintained

4 Full UniFi control

Rollback Plan:

1 Disable bridge mode on XB8

2 Disconnect UXG WAN

3 Reconnect XB8 as router

Questions:

1 Is this staged approach recommended?

2 Is short DHCP overlap acceptable?

3 Will XB8 2.5GbE work reliably (I heard some issues that after enabling bridge mode the speed can be impacted for 2gbs plans)?

4 Any MAC binding considerations?

5 Best practices for smooth transition?