Most efficient Minecraft Witchfarm 1.16.5 Java?

I need a witch farm and so I explored the area and found a double witch hat. Now I wanted to build the witch farm according to this design:

I wanted to build this farm twice and connect it to each other as shown in this video, at the end.

Now the questions arise. Can it be done more effectively? If not, it is at all possible and how much more effective are parameters in the best possible double witch farm. Also, how far can the witchhuts be apart to implement it that way.

If you stick to the 2 farms it is most efficient.