Hello, first of all, apologies for the confusions. We actually did not have this product category in our Posting Guidelines, and from your great hunting suggestion, we decided to add a new category in our PG.
Innovative engineering inventions
In this category, we will accept some hardwares, gears, or items that have a GREAT LEVEL OF ENGINEERING INVENSIONS inside. For example, your tent has a mathematical calculation to make a space shift.
So, your product is verified and got first rank as the same. Thanks!