Thanks for your comment. I'm going to be going with this wall mount to secure my PC to one of the side panels:

https://www.amazon.com/dp/B08ML9Z857?ref=ppx_yo2ov_dt_b_product_details&th=1

I built a shelf into my ALU for the PC to sit on. Hopefully this mount will let me easily remove my PC if/when necessary but also stablize it during more "aerobic" game play episodes.