Thanks everyone for your replies.  I didnt end up buying the auto lug nut locks but i think in theory they would work.  My concern was that they all have a conical tapered contact point with the axle and i was worried it could damage the bike if over tightened, as the contact surface area is small.  the cone shape is meant to fit flush with car wheels i think.  I ended up buying the ebike package from pinhead which has all the components i need and pinhead confirmed with me their solid axle security nuts fit with my Rad Runner.  It does cost an extra $20 to get the m12 size security nuts though.

https://pinheadlocks.com/shop/en/lock-packages/105-2969-e-bike-quick-release-and-solid-axle-2-pack-wheel-locks-quick-release-f-and-solid-axle-r.html#/1-spare_key-_/3-key-with_key/13-axle_diameter_lock_nut-3_8_solid_axle/97-quick_release_axle_length-125_mm_standard_front

Interesting. M12 is pretty big and i've seen car wheel locks for this size.  Curious if those would work as they're much less expensive.  It looks like pinhead makes a special more expensive M12 locking nut.
https://pinheadlocks.com/shop/en/solid-axle-locks/37-284-solid-axle-wheel-lock-one-wheel.html#/1-spare_key-_/103-axle_diameter-m12/3-key-with_key
Other question i asked Rad was the threads per inch or pitch of the M12 bolts.  I've seen different locking nuts from 1.25-1.75 pitch.  This is all fairly foreign to me so i'm trying to research as much as i can.

Does anyone know what the size of the rear axle is?  and what the TPI or pitch is for the threads?  Looking for wheel security.  I've seen wheel locks for cars for M12 size bolts.  I don't know if those would work as well.

Hi Dave, did you ever get an answer to this?  I've got similar questions.  I emailed rad today.  Hopefully they reply soon.