I have faced the same issue and got fed up with it. Soooo, I built a vise. First I tried the cast iron vises, made me nervous as a cat in a room full of rocking chairs.

I used to sell these, still sell the plans but anyone with any skill at all can just design their own make them up. Take a look here and scroll down the page for a pic, there are some videos also. Not trying to sell you the plans, just trying to help.

https://www.tedreischl.com/cnc-router-vise/