I’m sorry; I don’t know how to shorten the link. I hope this helps you.
You need a cookbook shield: https://www.amazon.com/Norpro-Acrylic-CookBook-Tablet-Holder/dp/B0002ZFXOQ
You can get book easels...might find them in cooking or a college bookstore. That is probably better for your purpose as it would sit upright. This one might be good https://www.amazon.com/dp/B0002ZFXOQ/ref=cm_sw_r_apan_i_ACMZWQ3AZQ3XJ35M0XKH
Another option is book weights. You can make your own. https://lifehacker.com/make-a-super-cheap-book-weight-out-of-pennies-and-duct-5833754
You could use one of those clear cookbook shields, like this