This is a set of 3 supports/shelfs that are designed to hold the common hookup wire boxes. They can alsohold individual spools and small parts. These are intended for wall mounting using double sided tape. I used: https://www.amazon.com/gp/product/B08NDTLRLC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
It works but periodically comes loose. Maybe this is better: https://www.amazon.com/Mounting-Removeable-Adhesive-Waterproof-Picture/dp/B09XLHCSP4/ref=sxin_16_pa_sp_search_thematic_sspa?content-id=amzn1.sym.679ca254-fe3a-4b5e-a742-a17f009c74a4%3Aamzn1.sym.679ca254-fe3a-4b5e-a742-a17f009c74a4&cv_ct_cx=3m+command+strips&dib=eyJ2IjoiMSJ9.sVxVe3EygEJa7SO1obHIUgO4DsyKj4ZTCtq-Hb9hRgg9a5nKeOUIE1u0iu8Xip0M-V9vaH5q6I3lZIG5sL1u5A.gXslrhYceasa7k-sN2F5VJ8Yvrsy4OAnKr9AFK7QF8g&dib_tag=se&hvadid=651215567027&hvdev=c&hvlocphy=9020165&hvnetw=g&hvqmt=e&hvrand=16603413843751444744&hvtargid=kwd-1548927100&hydadcr=7553_13626081&keywords=3m+command+strips&pd_rd_i=B09XLHCSP4&pd_rd_r=d6e6cce0-075d-452f-8478-b148bbc4ee60&pd_rd_w=4cQ85&pd_rd_wg=3FxIp&pf_rd_p=679ca254-fe3a-4b5e-a742-a17f009c74a4&pf_rd_r=X21XF2XEXYYK90R1BC57&qid=1716838539&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=1-1-364cf978-ce2a-480a-9bb0-bdb96faa0f61-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9zZWFyY2hfdGhlbWF0aWM&psc=1

The step file could also be uploaded and holes added for mounting with screws.