Hi - I’ve been using the Lineage 16 linked to above on FP3 for about a month or so:
It’s working fine for most things - some very Google-dependent apps won’t run or don’t work properly, but most apps are working fine. Auto brightness isn’t working (doesn’t show up in settings).
Location was working from the start (which I’ve found to be a problem sometimes on non-Google installations), but I tried to install microG anyway, but that made things worse, as lots of apps crashed, so I’ve got that disabled for now.
Was quite a bother to get it installed, but has been perfectly stable and reliable since. Tried probably three other recommended GSIs but couldn’t get them to install & boot.