Attached is the 3d model of the divider I'm using for my acrylic stands! They can be placed in between stickers to keep them upright and prevent them from getting mixed up.
I use them on these two different acrylic stands from amazon:
https://www.amazon.com/dp/B0C592B3CG?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_7&th=1
https://www.amazon.com/dp/B0BJKG1HRT?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1
Just wanted to share in case it's helpful for others :o)