These suction silicone plates have been designed to be apart of your babies weaning journey. Suction so they stay in place on most surfaces (some smoother treated surfaces like Stokke Tripp Trapp tables don't lend themselves well to any suction)
Silicone is one of the easiest surfaces to clean and also being dishwasher safe and microwave safe means you can even heat food straight on the plate. Silicone has a very high melting point so unless you plan to place it in an environment over 200C then you should be fine.
Alternatively you can simply wipe clean with running water and even dried on cereal will come off in minutes not days.
Some measurements may vary slightly with production.
All suction plates are strongest when pulled directly up. Sideways all plates on the market vary but you can do a few things to help:
Check out these site for some nice recipe ideas to get you going:
https://www.ellaskitchen.co.uk/weaning
https://www.annabelkarmel.com/recipe-category/baby-recipes/