There is no need to add two more posts, just to say ‘Thanks’. The best way to handle it is to click ‘the ‘Like’ button to acknowledge that you read the answers and that they helped you, unless you have a follow-up. An only ‘Thank you’ post does not really add any value to the thread.
Generally, the more posts a thread has the less readable it is and the more likely curious members will shy away from it.
If you delete the posts, my post becomes irrelevant, at which time I will delete it.