How much weight to put in the crab pot to prevent it walking?

I have these collapsible Promar traps that feels pretty light weight.  How much weight do I need to put on it for it to stick to the bott0m?  Assuming a calm day and around 40 to 60 feet of water out in HMB.

EDITED I didn't read your post carefully enough and missed that you were asking about Promar traps. What I wrote is for Danielson traps.

I don't put any weight in my Danielson traps. Just be sure to use enough line (use lead line or weight your lines so it doesn't float) so the float does not get taught with swells or tide. If you are leaving it for days at a time or in a bay with fast moving current then you might want to add some weigh but if you are just leaving it down for a day someplace like HMB it will be fine.

I think I use about 2-4# of weight in each of my traps, both promar and danielson.  An old diving weight ziptied to the floor works, and so do a couple pairs of 1.5 foot long rebar ziptied inside of a cut bicycle tube (to try to prevent electrokinetic reaction some people say crabs don't like).

I crab in Bodega, and unweighted traps tend to walk away with tide and current.  A bouncing, moving trap won't catch crabs.
 
Most of my traps are actually salvaged, as I have found several unweighted rigs over the years (none had legible Go-Id buoys).  The owners probably thought they got "pirated", but in reality they weren't setup properly, and eventually washed up on shore.

Does anyone have insight into weight differences for the foldable rectangular traps vs hoop nets? Wondering if I can get away using my lobstering hoop nets up north for crabs

I have lead lines.  I only plan to soak about 2 hours and check.  I'm thinking to start with 2 pounds and see how that goes.