Zero upside? LOL, no.

I'm looking for convincing decoy ALPR cameras because I don't think my HOA will go for a real setup, and I've got concerns over the product's security. I want the appearance of surveillance if I can't get the real thing. Being on a Flock/ALPR tracking app/site would be a huge win.

There is no benefit to signaling one's virtue in this scenario. It's like having a sign in your yard that says "Proudly Gun-Free Household".

My neighborhood is very safe and we have no such cameras. What problem are you trying to solve and why do you think cameras are the only solution?