I came across these today (Amazon thought I might be interested!). If I had known how haphazard it would look to line up multiple 2-pin terminal blocks, and if I had known about these, I might have tried using them. They're the same sort of 2/3/4-pin screw terminal blocks, but they can be clipped together to make various combinations in a fairly straight line. It would not eliminate the problem I came across later (fiddly, broken wires from the Cat3 cable). So, I might still have changed to the Phoenix connectors. They look handy to keep in mind for some possible future project where that isn't an issue.