Here’s info on using mesh systems with Sonos, scroll down for the mesh info.
You need to put it in bridge mode, this link is for Nest Wifi but prob similar or will give you an idea of what to look for
https://support.google.com/googlenest/answer/6240987?visit_id=638565561801237089-1844361076&rd=1
In my case I have a Spectrum cable modem connected physically to my first Nest Pro router and I have three Nest Pro APs, one on each floor of our bed and breakfast. Sonos tech support says I have double NAT, which is the problem but Spectrum support says their modems are not doing NAT and that they are not configurable in any case. I’ve looked into how to detect double NAT and seems if I see two private addresses in a traceroute that is the litmus test, I’m not seeing that.
C:\Users\bebew>tracert www.google.com
Tracing route to www.google.com [172.253.124.104]
over a maximum of 30 hops:
1 4 ms 2 ms 3 ms 192.168.86.1
2 19 ms 24 ms 12 ms syn-024-181-244-001.res.spectrum.com [24.181.244.1]
3 13 ms 14 ms 11 ms lag-161.dtr01mantnc.netops.charter.com [159.111.162.18]
4 26 ms 37 ms 29 ms lag-14.crr01hlrgnc.netops.charter.com [96.34.65.132]
5 39 ms 34 ms 40 ms lag-404.crr02spbgsc.netops.charter.com [96.34.95.68]
6 157 ms 39 ms 32 ms lag-808.bbr01spbgsc.netops.charter.com [96.34.2.50]
7 42 ms 42 ms 44 ms lag-804.bbr01atlnga.netops.charter.com [96.34.0.184]
8 44 ms 42 ms 49 ms lag-801.prr01atlnga.netops.charter.com [96.34.3.35]
9 45 ms 45 ms 43 ms con01stlsmo.stls.mo.charter.com [68.112.12.13]
10 67 ms 53 ms 45 ms 172.253.71.213
11 95 ms 124 ms 49 ms 108.170.248.104
12 50 ms 64 ms 96 ms 142.251.51.101
13 39 ms 39 ms 40 ms 142.251.51.106
14 52 ms 74 ms 65 ms 108.170.236.163
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 44 ms 44 ms 40 ms ys-in-f104.1e100.net [172.253.124.104]
According to Google’s online help (linked from your response, thank you BTW), I cannot disable NAT on my primary Nest router without loosing the APs, so I feel like I’m between a rock and a hard place.