This is Inspired by https://www.thingiverse.com/thing:2716592, because I am not a big fan of T corners, and all super big braces I want to try these, but without another drilling.
Since I've used normal and spring washers on my Anet, I noticed there is little gap behind screws, so why not use it?
After some measurements, one of my very first designs was born.It is completely hidden, and should not colidate with most mosfet cases etc.
Some M3x18 should be fine. Washers recomended. Holes are 4mm to limit some tolerances.