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You can do it the same way as with animals. However robots don't show up in any tabs so you have to set them manually one by one: when you select robot there are several color boxes under his name in left down corner, click on the third box (there should be something like "unrestricted" or name of one of your areas) and choose desired area.

I'm not sure whether it's bug of this extension or the parent mod. In previous version of the parent mod there was a bug that robots don't go for recharge when needed. In the last version of misc robots it was fixed, but today my builder bots don't go for recharge again (cleaners and haulers are fine). Looks like somehow builder bots have lower priority for recharge because they go for recharge if there is nothing to do and they need rest.