I own a couple collapsible anchors 3-4 lbs. for my kayaks. They hold well in all conditions.
Here is a link: https://www.amazon.com/Premium-Reflective-Foldable-Personal-Watercraft/dp/B01KFWL8VW?tag=kayaking0f-20
Also, make sure you create a pulley system on the boat so the anchor is deployed from the bow and you can raise and lower it from your seat.