I had great success with this trap
https://www.canadiantire.ca/en/pdp/c...3615p.html#srp and using the glue boards
https://www.canadiantire.ca/en/pdp/c...0889p.html#srp
In my backyard, I could not find the entry points where the voles were. I see the trail where they munch the grass and I would place the traps beside the plant bed where the tracks begin. I have 2 traps that I rotate around. I've been using them since 2016, 1st year got 20 voles, 2nd year around 10, last year 3. This year so far seen no tracks (usually see couple after winter's thaw) so haven't deployed traps yet. Another step I took was spaced out the plants and shrubs I had in my yard as previous owner kept things really tight so now more open space and less hiding spots for the voles, bonus is plants grow better with spacing.