Step 1: What You Need
2 x Rubber bumps
2 x Stick mount cup hooks
I got mine (Wilton Aluminum Cookie Sheet 12 1/2 x 16 1/2 x 1/4 Inches Deep) from Amazon for around $16. I chose an Aluminum one for better heat properties. I also chose a larger one as I might upgrade my laptop to a 15" later on.
Note: The cookie tray I got was thinner than I hoped so it would curve when the weight of the laptop is on it. But fear not, I have a solution, read on!
I over paid for my 3M Rubber bumps from Amazon. Any kind will do, Walmart has them for cheap.
Stick mount cup hooks:
I just needed something to lift the back of the laptop stand a little. There are plenty of things that will do this. I happen to have some of these hooks from a previous project, they came from Walmart.
Step 2: Making It
Mine looks a bit ugly because I put some tape on first. I did this so I can easily remove the rubber bumps and hooks without leaving glue residue. This way I can readjust the laptop stand for different laptops without making a mess.