Cool. Similar to the ones I made. I stood mine up though and sunk it in concrete in a 5 gal bucket. One thing I did wrong was not put a couple of boards beneath the bucket to keep it upright. I know two of the four I put in have tipped over. I imagine they are still doing their job, but maybe not as well.
Just an FYI,

9 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (going away), SMB, and HSB (only one seen in 5 yrs) Restocked HSB (2020) Have seen one of these.
I think that's about all I should put in my little pond.
Otter attack in 2023