Blood sacrifice - optimisation?

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Molog said:
Group all your bloodhunters together and press shift+z. Now you only have to click on one of your bloodhunters in each province and click shift+z.

Problem is that you also need a lab for that ... In my games I've never invested in labs in blood hunting grounds just for slaves pooling and had to manage manual transfers through scouts. But it was with Aby mainly, for Mictlan it's a real pain to *also* manage sacrificer fueling