So, looking at this implementation, it seems like we can simplify things a little bit. The selectors returned by `_getBlockSepSelector` will actually work here, I think. We just need to modify them a bit so that they work outside of being a direct child of the body element in any case where there is an `ol` or `ul`. For example:

`$body.find('ol table + table, ul table + table').before(placeholderNode);`

Does that make sense?