I purchased the Creality Ender 3 Glass Bed and didn't have any binder clips on hand, so I used these (Robo3D C2 Glass Bed Clips) as a template.
I provided 2 different layouts, I'm not sure which will be stronger. I guess either way, I don't see them lasting long as I am sure they will warp but they will last long enough for me to print a couple of times I'm sure.
I printed them at .18 layer height and figured the more infill the better to reduce warping. I guess you could go 80-100% to make it as strong as possible.