I need help with a grid building system?

So I was using this video to make a a block placement system: https://www.youtube.com/watch?v=x1YmQNzf5dQ

The code is here

local snap = 3


game.ReplicatedStorage:WaitForChild("PlaceBlockRE").OnServerEvent:Connect(function(plr, blockType, target, targetSurface, removeOrPlace)
	
	
	if removeOrPlace == "placing" then
	
		local position
		
		if targetSurface == Enum.NormalId.Top then
			position = target.Position + Vector3.new(0, snap, 0)
				
		elseif targetSurface == Enum.NormalId.Bottom then
			position = target.Position - Vector3.new(0, snap, 0)
				
		elseif targetSurface == Enum.NormalId.Left then
			position = target.Position - Vector3.new(snap, 0, 0)
				
		elseif targetSurface == Enum.NormalId.Right then
			position = target.Position + Vector3.new(snap, 0, 0)
				
		elseif targetSurface == Enum.NormalId.Front then
			position = target.Position - Vector3.new(0, 0, snap)
				
		elseif targetSurface == Enum.NormalId.Back then
			position = target.Position + Vector3.new(0, 0, snap)
		end
		
			
		local blockInPos
			
		for i, d in pairs(workspace:GetDescendants()) do
				
			if d:IsA("BasePart") and d.Position == position then blockInPos = true end
		end
			
			
		if not blockInPos and position then
				
			local newBlock = blockType:Clone()
			newBlock.Size = Vector3.new(snap, snap, snap)
			newBlock.Anchored = true
			
			newBlock.Position = position
			
			newBlock.Parent = workspace
			
			game.ReplicatedStorage.PlaySoundRE:FireClient(plr)
		end
		
		
	elseif removeOrPlace == "removing" then
		
		if target and target:FindFirstChild("Placeable") then
			target:Destroy()
			
			game.ReplicatedStorage.PlaySoundRE:FireClient(plr)
		end
	end
end)



local gridX, gridZ = 100, 100


for x = 1, gridX do
	
	for z = 1, gridZ do
		
		
		local block = game.ReplicatedStorage.Blocks.Grass:Clone()
		block.Size = Vector3.new(snap, snap, snap)
		block.Anchored = true
		
		block.Position = Vector3.new(snap * x, snap, snap * z)
		
		block.Parent = workspace
	end
end

I want to be able to place a block I am not directly looking at, but will still be connected to another block when placed. Does anyone know how to do this?