To mount other parts (like PCBs) to my models, I install a rivet nut with standoffs. A nice tool is available to use with your cordless drill. Takes some practice, and works best with 1/8" to 1/4" acrylic.
Rivet Nuts: https://www.amazon.com/gp/product/B07K83QHFN/ref=ppx_yo_dt_b_search_asin_title
Tool: https://www.amazon.com/gp/product/B01JBO58FM/ref=ppx_yo_dt_b_search_asin_title