I wanted more T-nuts for my shapeoko pro hybrid table, so I made a print that accepts heat set inserts. These specifically (M6x10x7): https://www.amazon.com/gp/product/B08Z7541M5/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
I insert them from the bottom so they have better holding force. I was able to torque them to 80 in-lb before the insert started pulling through. That equates to over 1500lb of clamping force. Should be good enough!
The author marked this model as their own original creation.