Maybe a white highlight. I’m often found it frustrating when decide to delete some built objects but end up deleting other same type of object nearby instead.
Case scenario: decided to delete sandbag wall in front of me but it deletes another one behind it, decided to delete sandbag wall but it deletes rally point instead because I forgot to look at the text which object it deletes.
With white highlight around the objects, it should be easier to notice than reading the text and it doesn’t work to indicate if same type of object are built closely.