Thank you masterxeon1001 !
Buy masterxeon1001 a beer!
(click on the Donate Box, enter an amount and pay using Paypal)
Blender 2.8.x / 2.9.x
Get it here: https://builder.blender.org/download
Make sure the empty that has the Constraint (transformation) on it, is not parented to anything. Remember, you parent the instanced collections, not the source object.