Mouse proofing

Anyone got any experience with mouse proofing for the winter? Just moved to a rural property in the woods and found evidence of mice in the attic. Fortunately the doesn’t appear to be any inside atm (although I need to take a lot of underlay up to have a better check 😬) I suspect autumn winter may become a problem. I’ve bought some catch and release traps to put up there, just incase.

Anyway it’s a shiplap cladded house and there’s a gap between the cladding & the concrete subfloor, I can only assume that this is how they’re getting in, as the house is pretty airtight. So my mission this weekend is to get it as mouse proofed as possible before the colder weather sets in.

I was looking at stainless steel mesh, is this the right way to go? The appears to be a rim where I can staple it to the bottom of the cladding side (there’s some old mesh there already but the holes are nowhere near as small as it needs to be to stop mice) but I don’t know how to attach it at the concrete side, I don’t really want to go drilling into the subfloor, can I just bend it and then use some sealant or something? Does it even need to be attached if it’s pushed up tightly (idk are mice strong can they pull/push it out the way 🤣) I don’t know if I’m just overthinking it, this is just new to me. It will be a lot of mesh as these gaps are around the whole of the house, so I’m just going to roll it out the length of the house and attach it. Any advice greatly appreciated, thank you 😊

Pics are with camera on the floor pointing up if that makes sense, I cropped my ugly mug outta the pic 🤣