pay the money and get a sheet of printbite. Self adhesive, lasts as long as the printer and saves money in the long term and hassle right from the start.
https://flex3drive.com/product/printbite/
For a sheet of 15x15 - it's only £14.35 - so probably 16-17 euros.
Cheaper than epensive glass and better.
With glass you still have to use potions and lotions.