Sorry for this question if there is something I have missed, but why not use the official "Pick by Unique ID" condition instead? Does picking instance(s) cause issues that I'm not aware of?
If you want to sum the position of some instances, you might need pick them individually in conditions. This plugin could get the properties without picking it. So you could sum it in a single expression.
If you want to change position of sprite or tile background, you might have two pairs conditions for each type. This plugin could change position in a pair of conditions.