Go to edit the list widget from your custom module and go to Advanced -> ControlDefinition -> Views -> ModuleFrontendList -> FilterExpression and there add the following at the end
AND Category.Contains((160DC75B-5EA0-4AD2-8358-A411360FDBCE)) AND Category.Contains((584516ED-7F6A-447D-81A8-D1CB016F02B7))
where the two GUIDs are the IDs of the two Category taxa that you must check in the database.
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