Not quite sure how to describe it, but this alternative triangle base + attach part lets you "offset" the triangles (see pictures). You'll need 2 "attach" parts to connect 2 triangles together. 

Unfortunately it also requires more screws. For those who cannot find 3MM screws easily, short US #4 wood screws worked well for me and were far cheaper.

Also notice that the new base I designed have one of the bridge thicker. I used that to mount the thing to the wall instead of having an addationnal part. I also didn't use the original electronic box, I don't think it's compatible with my new base.