HODOR!

Using this little fella, you can place and rotate him, so it fits under the problematic corners of your print. It is easier to clean than a brim and should help with lifting the corners of the print as well. I just tested it at 50% scale. And I might add a teardrop shape as well. If it works better, with slightly better shape for sticking to the surface. You can also rotate it and move it, so the whole circle fits under the corner.

I am not sure where I saw this, but probably youtube. So I am not sure where credit is due. If you know, let me know. I'll put link here < >.