Happy to help! You can find the Extension here.
Note: After you download, make sure to unblock the zip before extracting. Once extracted, you should have one folder called DynoSnapper, copy this to your packages directory for whatever version of Dynamo you are using (this should be along the lines of …appdata/roaming/Dynamo/Dynamo Revit/[Version]/Packages) and you should see it when you open up Dynamo.
I have tested against Dynamo 2.0.3 → 2.6 (or Revit 2019 → 2021) and works as expected.
I’ll post the code up on GitHub on the weekend so you can have a look how it all works and do what you want with it and you’ll also see it’s not all that magical! 