I have seen those tennis one similar to this.
https://www.amazon.com/Equipment-Self-Pracitce-Rebounder-Including-Beginners/dp/B08MVMLR6K/ref=sr_1_10?crid=22WYOMW2EI4HO&keywords=tennis+trainer&qid=1701009758&sprefix=tennis+train%2Caps%2C307&sr=8-10
I saw people on youtube making something similar and decided to experiment.
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