need advice re: carpenter ants

western mt -

We definitely have carpenter ants in our home.
I possibly found main nest in a douglas fir, about 1/4 mile away.
We've been using Terra bait traps for a few weeks inside.
There are a few locations where I found them coming in from the walls - under a window, and a door jam, for example.

I found two outdoor areas where they seem to be entering. I cannot find their entry point, only the region. I need to do something of a barrier - to prevent more from coming in.

I am very worried about ecology-effects.
I want to avoid diatomaceous earth - as I don't want to kill other insects.
I'm also worried about effects on a local toad spp (western toad - endangered where i live).
Especially for the outdoor areas, I'm worried about food-net effects of others eating the baited ants - birds, spiders, toads, etc - will they get sick if they eat ants baited with Terra (borax)?
Haven't found research about this - any recs?

For the colony that lives in our home - what should we do? I don't  have a sense of where the nest is. What least-toxic options are there?

thank you!

From Google http://www.idph.state.il.us/envhealth/pccarpenterants.htm#:~:text=Carpenter%20ants%20are%20one%20of,a%20threat%20to%20structural%20integrity.
'Carpenter ants are one of the most common household pests in the Midwest. Besides being a nuisance indoors, these ants damage wood by hollowing it out for nesting space. While carpenter ants do not eat wood, large colonies can be destructive; however, are more of a nuisance than a threat to structural integrity.'