I have used and make excluder one way systems for mice, shrews and voles for a long time. They work great but you do need to do some preventative seal work as stated as is reasonable.
I first stated using them for ground level mice, voles and shrews in ground level screen vents that are used in some block construction for crawl spaces to breathe. These vents are always very low to grade so they are prone to rusting and then chewing is eminent in time.
I have seen voles, mice and shrews fire right through these devices. I have had several exit right between my knees in front of me when kneeing to finish a device install on many occasions. They do work.
If you block off the vent screen with plywood or heavy cardboard and insert the device in over the chew holes they find them fast and will use them. Give them the air flow and the small light source illuminating the vent area and they find it very quickly.
I leave them on for a couple of weeks or longer. It really depends on the time of year.
Summer months with warmer temps get the best activity obviously. Not sure how well they would be in winter and cold temps as most rodents won't stray far from their comfort zone usually once they become familiar with their new habitat. But may depending upon food needs at the time.
In that case I might leave them installed all winter until late spring to remove them.
Here are a few photos of the devices and mounting plates to fit various positions on an average venting screen that are common in our area.I have placed a 1-1/4" washer by the devices as a reference to size this is always helpful. The opening is 1-1/2" made with 1/2" x 1/2" 16 Ga.GAW wire. The excluder is 6" long. They can be made to fit any situation that will suit your needs.
The door is a very light weight 1/4" hardware cloth material. Built much like other larger excluders used for squirrels etc.