I need the users to place a limited quantity of the products that I offer on my website. For ex, for a certain category I want the MOQ to be x and for the other y. Is this possible on your platform?

You do have an option to define the max limit and min limit to buy a particular product. Follow the steps below to define the max limit to but a particular product:

• If the product has no variant:

1.  Go to Products > Products section in StoreHippo admin panel.
2. Click on Edit and go to Miscellaneous tab.
3. Mention the max and min limit there.

• If the product has variants:

1. Go to Products > Products section in StoreHippo admin panel.
2. Click on Edit and go to Options & Variants tab. 
3. Click on edit for the respective variant and mention the max and minimum limit to buy this product.

Refer the following link for more details:
https://help.storehippo.com/topic/addedit-a-single-product
https://help.storehippo.com/topic/options-and-variants