This is where I'll have a giggle, before sorting out a few things myself.
For our home network setup, which is a bit spread out and idiosyncratic, I like using my Netgear R7000 to handle all wifi and other device connections that are not Multicast / TV.
When we were using BA up until mid 2019, I did this behind an Actiontec R3000 (I spoke about it in other threads here).
Interestingly, I only left the Actiontec 5GHz radio on (with 2.4Ghz and SSID broadcast off) for the R3000 for the VIP2502 receivers, and for the Motorola VAP's that helped them out.
My Netgear router was plugged into it via Ethernet, for wifi and other ethernet including powerline AV adapters, and I was able to leave DHCP on for BOTH BA's Actiontec and my Netgear R7000.
I ditched it all 6 months ago, as I was fed up with negotiating credits with retention annually, and we went to Netfox w/Atop.
Then a good BA Neighbourhood rep visits a month ago.
I told him I didn't want VIP2502's again, and that I just wanted PVR and access to the Fibe app for our Apple TV's and remote use; I'd been waiting for that option to be available to me.
After a nice 2 year credit saved me $50 overall monthly from what I was paying for Netfox with Atop IPTV on 5 devices, I had my install today.
We were fortunate to have good installer. I have HH3K->R7000 with DHCP on in BOTH. PVR is also Ethernet to HH3K. This means all radios on the HH3K are off, the R7000 is doing what I want, and I had nothing to do when I came home from work, which was unexpected.
I'm not yet getting close to the tested 1.17Gps through the R7000 - or even connected directly to HH3K 5Ghz radio, interestingly - but I'm only just poking into that.
I found this thread first, hope these comments help. I haven't had to put anything in front of or in parallel to the Actiontec, or now the HH3K.