How should I implement this code into my current script?

Hello, I'm creating a game where you have to fight enemy NPC's that are trying to get to the center of your base. I want them to randomly spawn in a circle around your base.

More info at bottom | The full script is at the bottom also

I didn't know how to spawn NPC's randomly in a circle, so I asked on Reddit and someone was able to give this answer: I've tried to make it work, but I honestly don't know what I'm doing wrong.

origin = Vector3.new(0, 0, 0)

x = 200 

y = 15

p = part

model.HumanoidRootPart.CFrame = CFrame.new(origin + Vector3.new(math.random(-x, x), y, math.random(-x, x)))

What I've tried: I added the variables origin, x, y, and p and inserted the code at the bottom of the main enemy script, and nothing happened.

I looked around and noticed that on Line 47, there was:

Enemy.HumanoidRootPart.CFrame = workspace.Spawn.CFrame + Vector3.new(math.random(-4,4),0,math.random(-4,4))

which looked similar, so I tried replacing that with the aforementioned code, replacing model with Enemy. This time the NPC's wouldn't spawn.

Extra Info

Honestly, this is my first time scripting, and I need help.

This code comes from Bereza's Tower Defence Demo. To add to that, I know that I'm supposed to be familiar with scripts that we post here, but, without Bereza's help, I would be stuck figuring out how to make everything from scratch, while constantly watching tutorials.

Main Spawning Code: https://pastebin.com/sHFwm2QP

Explorer and Studio: https://imgur.com/a/xTazyFu

Thanks for reading this, and I hope you can help.

I would recommend this.

local origin = Vector3.new(0, 0, 0)
local x = 200 
local y = 15
local p = part

--Other scripts that comprise stuff needed for the script below

model.HumanoidRootPart.CFrame = CFrame.new(origin + Vector3.new(math.random(-x, x), y, math.random(-x, x)))