I use this one! It’s on sale rn for 2 for like $10 (always came with 2) and was really easy to put on https://www.amazon.com/dp/B07Y1YKLNQ?ref=ppx_pop_mob_ap_share

I use this one from the store Zoegaa. I have an Air 3 but i found the listing for the 8th Gen so you can check it out! It comes with two so I watched some installation videos and managed to install it on the first try. I will just save the second one for the future.

(2 Pack) Paperfeel Screen Protector for iPad 8th 7th Generation 10.2 Inch (iPad 8 7) 2020/2019 Release, ZOEGAA Matte PET Screen Protector Compatible with Apple Pencil https://smile.amazon.com/dp/B07Y1YKLNQ/ref=cm_sw_r_cp_api_glt_fabc_QECH72QK6R07EM1V3S63