I run my own homelab and have a Ubiquiti gateway (UDM). I would have loved to have the fibre connection come directly into my box uninterrupted but the ISP's modem is required to associate the connection with my account (or something to that effect). Deeply disappointing.
More and more I see articles and videos about programmable SFP modules which can be used to directly connect devices like UDM to GPON/XG(S)-PON networks, completely bypassing the ISP provided ONT.
You may well find something that fits your situation with a little searching.
I have looked into it but I'm a little nervous to touch the hackjob fibre install they did and they cut the cable WAY short. I even asked the tech to leave cables as long as possible but
FWIW their box isn't bad once you put it in bridge mode. I have 10gig on my lan and 3gig to the edge and the connection is impressively stable at 3gig. I get 1 ping sometimes when playing Fortnite -- I'm on Vancouver Island. Comical if not inaccurate.
My only real issue with having their box is it sucks maybe 30watts ... Removing it would give me an extra 20 or so minutes on my UPS.
Funnily or tragically enough I opted for the 3gig service from my provider and they require their modem however the same provider on the 1gig service supports using your own ont so long as you use their gpon / SFP whatever.
