What is reddit's opinion of Portable Table Folding TV Tray Table Six levels of Height Adjustable 3 Angle Adjustments Folding Sofa Side Desk Snack Laptop TV painting Tray?
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This product was mentioned in 1 comments, with an average of 2.00 upvotes

Would something like this do what you need. It's on Amazon UK, but I'm sure you will be able to get something similar wherever you are