Help with an offset thing?

This is complicated... So I am making a script that randomly generates barriers throughout my tiny map. I want to make sure that there is a certain offset between the two, I know I would use magnitude, but how would I apply it in a script like this?

for i = 1, blocks do
local block = game.ServerStorage.Disco:Clone()
block.Name = "Barrier"
block.Parent = partmodel
block.Size = Vector3.new(1,math.random(7,10),math.random(15,21))
block.Anchored = true
block.CFrame = CFrame.new(math.random(-150,-100),game.Workspace.Platform.Position.Y block.Size.Y/2 + game.Workspace.Platform.Size.Y/2,math.random(35,102))
for i = 1,block.Size.Y do
	block.CFrame = block.CFrame * CFrame.new(0,1,0)
	wait(0)
end
	local safe = Instance.new("Part",block)
	safe.Name = "Safe"
	safe.Size = Vector3.new(100,block.Size.Y,block.Size.Z)
	safe.Anchored = true
	safe.CanCollide = false
	safe.Transparency = 1
	safe.CFrame = CFrame.new(block.Position.X + safe.Size.X/2 + 	block.Size.X/2,block.Position.Y,block.Position.Z)
	local imp = script.Script:Clone()
	imp.Parent = safe
	wait(1)
end
end