Book binding hot melt questions

Hello. Thanks in advance for helping me. I have a series of textbooks I sell on kdp, and I’m thinking on buying a cheap hot melt machine to make my own books:

Hot Melt Glue Binding Machine for A3(Short Edge)/A4/A5, 500 Sheets Capacity, Intelligent Temperature Control, Ideal for Office/Tenders : Amazon.ca: Office Products

If anyone have experience with these devices, I’d like to know if one can put together more than 1 EVA glue strips to bind a thick spine, since my books are very thick (30mm -50mm).

I’m also open to any other suggestions.