Hello,
Yes, you do not have any "sub category" but you do have a "product category".
You can't create a product without a category ; so your products are still in a category, even if you did not create it yourself. Right ?
And afterwards ; Please note that Joomla itself provide some features around meta tags within menu configuration.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.