I've mentioned this in another thread way back, but looking for a phone I could run LOS on, I worked out that starting here:

https://stats.lineageos.org/

And drilling down to the most popular phone for your country seems to turn up a fairly well supported model. I ended up with a Moto Z2 Force (https://wiki.lineageos.org/devices/nash) for pretty cheap, and I've been happy with it.